What do they use?

[Spawn of Sephiroth]

Ok, I was looking on You Tube and found all of these songs where people turned the original songs to sounding like Alvin and the Chipmunks were singing it. What program did they use?

[crono_logical]

I suppose any decent sound editor would be capable of doing that - wouldn't be much more than changing the pitch of the track, or if they only changed the voices but not the music, then also some vocal cut filter in addition to that would probably be sufficient If you want to get really accurate or clean-sounding results, a clever mix of those and non-vocal versions of the track you're editing will also work

I'd probably use CoolEdit myself if I wanted to do that, Adobe Audition or the free Audacity could probably both do it as well, amongst others, though I haven't checked them myself

[rubah]

windows sound recorder will do it. Increase speed.

[o_O]

Audacity is what I would use. Something like that will allow you to raise the pitch of a recording without changing the speed.

[rubah]

that's why you learn to sing low, mike DDDDDDDDDD

[Mirage]

Increasing the pitch while keeping the same speed tends to make the voice sound like it's vibrating though.

[o_O]

Sure, but it's better than having it play twice as fast.

[rubah]

http://www.snowy-day.net/stuff/Iron%20Man2.mp3 :P
Doesn't help unless you're the one singing it, but I like the effect myself