Practice tool/app/thing with pitch shift?

[JPJ]

So, I am looking for an app that can pitch shift songs from either iTunes or Spotify that allows you to build a playlist with the song and your chosen key. 

 

My current method is to drag the iTunes Media into GarageBand and pitch shift in there, but it’s a bit clunky, device dependent (i.e. not really portable between my Mac and iPad), and you have effectively got two versions of the song on your storage (original, and the copy in GarageBand. I know I could be a little less lazy and export the songs back out of GarageBand in my chosen key, but surely in this day and age there’s an app that can do this?

 

WARNING: iOS solutions only, Apple fanboi

[jimbobothy]

Anytune is an app with pitch shifting capabilities, but you need to own the song to upload it into the app. It runs on iOS well.

[PinkMohawk]

The Ultimate Guitar app lets you do this with their midi tracks, the official ones that they put out themselves. Transpose, slow down, solo instruments, all that good stuff, it's what I use a lot for practicing new songs, and if I connect to the PA in the practice room it'll fill in for missing members or whatever else I need. Of course, it's not the actual tracks, but depending on your use case, it might work for you.