Pick shorter songs? If you want CD Audio disk, 80 minutes is about it. If your player(s) can handle MP3 or WMA disks, you can get lots more music on the disk as a 'data' disk.
it is possible to do whats called a "overburn" on CDRs. not all burning programs can do it, but I know that nero does. You can usually overburn about 5 to 7 minutes on an 80 minute CDR.
You really need to provide what you are trying to do instead of trying to solve what you precieve as the problem. Usually the problem can be solved by altering your general approch instead of solving the dead end your approch has taken you.
Most standard run of the mill CD players will read 80 min which might be pushed to 90 min. Most audio CDs have 60 min or less. Obviously, you are trying to do something different. If your player reads compressed music (mp3s ect) they hold 10 hrs of HiFi music and much more at lower quality.
Maybe you are asking the wrong questions. Maybe you should be asking how do I cut a 100 min audio in half so I can make 2 50 min CDs. Then you don't have to buy a new CD player as part of your solution. I do recomend buying an mp3 CD player. They are well worth the money.