Computers and Singing

[Grantith]

This is a very strange topic, but I'm trying to find more info about how the music industry uses computers to help tweak or change singers' voices. I think it's pretty common these days for the music industry to use computers to help "improve" singing when people record new songs. I've been looking all over trying to find any kind of info at all about it, but I haven't much luck. I can't find anything so I just wanted to see if any of you have found any info about it. I greatly appreciate any help you can give me!