Lost songs on Ipod (Itune)?

I had 300 songs on my Ipod and thought I was putting some 200 new songs when I discovered instead of addition songs I lost my original. So my question is can I get them back and where r they on my computer. I have looked in My Music, My Files etc and no luck so where r they? Tnx and these new songs are terrible and I want my old ones back. By spook12sp...look for my music/itunes folder. you problably lost it; if you did not follow instructions, and you accidently erased them of itunes, they are always suppose to be on itunes, if not; they will be deleted.

it should be on your music under a folder called itunes, make sure they are on your library in the program itunes, they you update it.