Okay, I'm not sure how familiar you are with the command line. If you need some additional instructions just let me know.

You'll need to put these files on your N900:
http://repository.maemo.org/catalogu...3.14_armel.deb
http://repository.maemo.org/catalogu...3.14_armel.deb
http://pbx.org/~kyle/libhildonhelp.so.0

First put the 'libhildonhelp.so.0' in your /usr/lib directory. This is a dummy library that doesn't actually do anything, so don't expect help to work (probably will be the least of your problems . Then do:

dpkg -i --force-all rhapsody-player_3.3.14_armel.deb rhapsody_3.3.14_armel.deb

Do all of this as root. You should see rhapsody in the application menu. If you have problems then try running /usr/bin/rhapsody-player from the terminal and see what output it gives.