Where can I transfer my music from my iPhone 4s, but still have access to my music?

[iMore Question]

So full of music that I can't even take a picture

 

[Bigeric23]

If you've purchased your music from iTunes, you can download the music at a later date. So you could do a cleanup, but always be able to access your songs later. Or . . . you could tell iTunes not to sync certain songs.