Slowing Down a Song

Is there a way to edit the pitch of a song after you slow it down?

[u]Change Pitch[/u] changes pitch without changing speed
[u]Change Speed[/u] changes speed & pitch together (like changing the speed of a vinyl record).
[u]Change Tempo[/u] changes speed without changing pitch.
[u]Sliding Stretch[/u] changes tempo & pitch independently.

Changing speed & pitch together is straightforward and you don’t get artifacts. Changing either one independently can sometimes introduce artifacts and “going too far” with any of these will sound unnatural.