Can't believe I missed this - no way I could pick a favourite - I'll pick tracks by album -
Space Oddity - "Unwashed & somewhat slightly Dazed" (engraved on the back of my iPod), "Letter to Hermione"
The Man who sold the World - "All the Madmen"
Hunky Dory - "Queen ***", "Andy Warhol"
Ziggy Stardust - "Ziggy Stardust", "Moonage Daydream"
Aladdin Sane - "Panic in Detroit", "Lady Grinning Soul"
Pinups - "Sorrow"
Diamond Dogs - "Big Brother", "Sweet Thing"
Young Americans - "Young Americans"
Station to Station - "Golden Years"
Low (my favourite album) - Warszawa
Heroes - "Joe the Lion", "Sons of the Silent Age"
Lodger - "Look Back in Anger", "Repetition"
Scary Monsters - "Teenage Wildlife"
........and loads of others, as the mood takes me.
Sadly, for me, this is where he went downhill at a rate of knots - I bought "Lets Dance" and thought it was crap and then bought "Tonight" and it was worse.
I still regularly play his best (and the best regularly changes).
A legend (and my own personal Hero)
Generally speaking, you aren't learning much if your lips are moving.