Jonas Brothers – Keep It Real – Official Music Video

How do you get music off other computer itunes libraries without losing your own music?
I have music on my itunes ipod but I would like to get the music from my friends computer. Does anyone know how I can keep my music on my ipod and library and get my friends on as well.

Music Video for Jonas Brothers’ “Keep It Real” off of their album Lines, Vines and Trying Times. Available on iTunes Now!!! itunes.apple.com