music

How do I transfer music from an iTunes list to another?

Okay, so I have like 3 different computers, and I have an iTunes list on each of them and have different music on all of them. So it is a possibility that I can compile my music on a computer? I know it is a website out there But I can not remember what it means. Other than burning all my music on CDs or separate database, music CDs, I can all my songs from one computer to another? Thank ya!

IM files you import them into iTunes.

Beyoncé – Single Ladies (Put A Ring On It)