If I delete Itunes, will all the songs I downloaded go with it..?

Don't ask me why, but I am done with Itunes... Its been a tedious process transferring all my Itunes files to MP3. I wonder cause I've seen this with Real Player and Windows Media, I deleted Real Player and all the Real Player files changed back to WMA files. I want to delete Itunes, but not all the songs, I would like a little advice please..?