Be careful with this one, to not delete too much things.
Agreed. Use with caution. If you are not sure, best leave alone unless you are short of disk space.
My chosen media player for music is now Rhythmbox. Its got a nice UI and is extremely easy to use.
Have you tried Amarok and Quod Libet?
One major problem I have always had with Linux is having libraries installed that are not required
The same happens Windows. I am pretty sure that if you uninstall an app the DLLs it installed are not removed. AFAIK MacOS avoids the problem by having a separate copy of libraries (other than those included with the OS, of course) for each app.
@wheel, command line is very often faster and more powerful, but the learning curve is substantial. That said, I have bee using Linux for nine years and never used the command line that much.