Name something about CD's that makes them more popular than cassettes?

There are limitations in the technical quality of the sound you get with tapes. Problems with tape recorders: http://en.wikipedia.org/wiki/Tape_recorder There is wow and flutter with tape recorders: http://en.wikipedia.org/wiki/Wow_(recording) There are distortions k3: http://en.wikipedia.org/wiki/Tape_bias There are limitations in dynamic of the music: http://en.wikipedia.org/wiki/Signal-to-noise_ratio Cheers ebs