Greetings.

There is something that i wish to know and considering my job status its a bit odd to ask as well as a bit behind its time.. I used to burn a LOT of music Cds on standard 700MB CDs and was only able to fit around 19-25 songs depending on the titles. I remember years ago when i was little when in europe friends would exchange CDs in their cars and these disks would contain around 100-200 songs! Not only am i trying hard to remember some of the titles, but i want to know what kind of CD has that capability? I remember id be sitting in a Polonez or a Fiat from time to time in my neighbours car when i was 12-14 and swapping disks and going from 1-150ish songs. Good question. All music on CD or DVD  must be some e kind of DIGITAL form. Unlike the old 45 RPM discs teenagers had 50 years ago.
The standard for CD audio has been to limit the amount  to music to about one hour on one CD.  I think the time limit is 70 min.
When the advent of  new  technologies, data compression allows more music to be  put on the same 700 MB CD disc. One of these is called MP3, which can do a 3 to one compression with almost no loss of quality.  Over 6 to one compression is possible. With careful equalization and other effects, the quality is still good.

Here in the USA many retailers  have entered into some kind of conspiracy with the the record s industry and seldom offer CD players that can decode MP3. Maybe it is not the same in Europe.
This is not my idea. It has been documented.
http://gizmodo.com/239512/gizmodos-anti-riaa-manifesto
Quote

In effect, the RIAA's insistence on strict DRM takes value away from legally purchased music. People have a choice: they can either pirate unrestricted MP3 files that will let them use them however they'd like, or they can pay for files that won't allow them the freedom to listen where and how they choose. It only makes sense that many tech-savvy people choose to download MP3s rather than pay for crippled files. The RIAA wants people to pay for restrictions and like it.

Good question. All music on CD or DVD  must be some e kind of digital form. Unlike the old 45 RPM discs teenagers had 50 years ago.
The standard for CD audio has been to limit the amount  to music to about one hour on one CD.  I think the time limit is 70 min.
When the advent of  new  technologies, data compression allows more music to be  put on the same 700 MB CD disc. One of these is called MP3, which can do a 3 to one compression with almost no loss of quality.  Over 6 to one compression is possible. With careful equalization and other effects, the quality is still good.

Here in the USA many retailers  have entered into some kind of conspiracy with the the record s industry and seldom offer CD players that can decode MP3. Maybe it is not the same in Europe.
This is not my idea. It has been documented.
http://gizmodo.com/239512/gizmodos-anti-riaa-manifesto
But you don't need to buy a new MP3 / CD player for your car. But maybe that is off topic.  Do you want to know what I did?

Geek is right. Before cheap flash memory came along, the only way to carry a lot of mp3 files around, or listen in a car, was to use a CD player with mp3 capability. I still have a portable CD player from around 2002 that I bought in England that plays regular music CDs and also CD-ROMs with mp3 files in folders. Assuming a regular CD-ROM size of 650 MB, and that an average 3 minute song uses around 3 MB, you could fit 200 or more songs on a disk. Most built-in CD players that came with a car could not play mp3 disks but you could buy "after market" units which could. If you had a suitable burner drive in your computer, you could "overburn" some brands of disk and get maybe an extra 50 MB but not all players could play to the end of the disk. My friend had a mp3 capable car player that would not play overburned disks reliably. My portable player used to really eat up the AA cells (4 at a time) so I used to use NiMH rechargeables and carry a spare set.

OK. Best solution. Forget the CD for a moment. Back to that later.
A USB flash drive holds at least 2 GB or more. For some time now anything less that 2GB is not being sold. I mean you get a cheap good flash drive for under $5 from a good on-line source.
What people now  do, if the cannot afford a new car, is buy an MP3to FM converter At Amazon and other places they go for about $20 more or less. I have used these and most work very well. Some have a remote control you can hold in your hand and flip tracks without taking your eyes off the road.
Here is a list of many such gadgets.
MP3 to FM adapters at Amazon
I prefer the one with a remote control and takes a USB flash drive.  Asa you said, flipping tracks from you smart phone is awkward and dangerous.
Now about those MP3 CDs you have. Keep them. Just copy form them direct to the USB flash drive.  With a 2 GB drive you should have enough music for a long road trip. Or get 8 GB and travel for a fortnight.
Does that help? 

BTW: Some of these do both MP3 on USB or else analog audio from a headphone jack. And if you want to use it  in the house, get a 12 wall adapter and clip the leads to the cigarette light plug.
Some models lets you tune to any FM channel.

Exactly. I used to (and still have the machine) burn Cds on my Old Pentium 3 IBM, and using Nero Burning Rom 9, it gave me a max or yes, 70Minutes or 650ish MB and i wouldnt get much on the Cds..

With your iPhone there are some concerns with Digital Rights Management. Of course you can transmit the headphone out via a FM transmitter. But the remote only works for the MP3 device inside the adapter of a M3/FM device sold by Amazon in the link I gave earlier.

Which iPhone? Does it have voice command? You can just tell it to go to the next track. Or can you? Never tried that, mine is an phone 4.

Hey! There is an idea for a new App. One that will catalog your music and play songs your request with voice command. You might  say 'Play Dsperado by Linda Ronstadt' and it would. If  you had it.
Dsperado by Linda Ronstadt

Yeah, it is amazing how cheap the SE Asia people can make some stuff. Hard to believe. The technology is moving faster than social changes.

EDIT:  Missed a detail. When you have audio CDs they can be converted to a good MP3 format that plays on MP3 players using tools like Windows Media Player.
http://windows.microsoft.com/en-us/windows/rip-music-from-cd#rip-music-from-cd=windows-7

if the program doesn't a "MP3 Audio" option, you can just burn MP3 files to the disk. When you burned the disc you were creating an Audio Disc, which burned it in the standard, uncompressed audio format of Audio CDs.

The program would ask what im burning:

Audio CD
Data CD
or Copy a CD

So i guess i didnt have that choice. So simply dragging and dropping would allow me what i want correct?