Comment 8 for bug 139459

This application doesn't seem to be in development anymore. I believe this is supposed to be its homepage - http://www.tf.hut.fi/~flu/hacks/cplay/ which has an error message (I think). The link posted takes you elsewhere, which also seems to have an error message.
As for dependencies, having it ask you for a program that uses it is not how the system works. There are certainly many, many packages out there that are useless without programs that use them, but we can't expect the package managers to ask you each time you install such packages (though you could try to file a bug report to request that if you really thought it was necessary or useful w/out being annoying). If you want to see what available packages depend on a specific package, use
 apt-cache rdepends <package>
If you were to run
 apt-cache rdepends python | grep cplay
you would see that cplay depends on python.

I feel that, because of the above, this bug can be closed with status Won't Fix - please let me know what you think. Thank you.