since i was looking for a way to earn money since i got so much music i bought over the years i got atleast 4000 songs or so and i was wandering if there is some online service that u can sell your digital music or something similar

I guess you could set up a site to do it but I have no idea about the obvious copyright legislation effecting this type of transaction. I haven't heard of a site that you can use for this either.

well i guess if i did set up a site i would probally hit the possibility of getting sued

Hehe, yes I think you would

There's always EBay (apparently)

u think ebay would work but would i get sued still?

There is a chance that you will fall foul of the law whichever route you take with this project. Sadly, I think that the music is still legally the property of the Artist's and record companies and re-sale is not permitted.