Bowie has always collaborated with great musicians, in particular guitarists, that have inspired his music as it changed over the years...
One of my favorite Bowie guitarists, aside from Mick Ronson (RIP), is Adrian Belew, whose guitar stylings contributed mightily to the "Scary Monsters" album (Side 1 is one of my favorite album sides - here are all five songs):
I always knew that Major Tom was a junkie...
ADG