Misc: which u.s soul singer was known as 'lady day'?

Questions

50 Easy: Of the 80 zillion rap versions of "Knockin' Boots," his was the most successful?

50 Easy: One could find "Alphabet St" on this Prince(or whatever he calls himself) album?

50 Easy: Two albums on which STP's "Big Empty" is available (use and)?

50s Tunes: "Let me see what life is like from Jupiter and Mars."?

50s Tunes: "Spider Murphy's playing on the saxophone."?