How do i make 1 song on my ipod come up under 2 artists?

For some albums on my iPod, songs come up for different artists than
the album artists.

For example, on the album 'Late Registration' by Kanye West, many
songs come up in different artists when i browse the artists on my
iPod. For the song 'Gold Digger', it comes up as Kanye West  Jamie
Foxx but i want the one song to be under Kanye West as well as Jamie
Foxx when i browse through artists.

Also, i dont want 2 copies of the song as it would take up space
(obviously).