It's a Cellar's market as it bids adieu.

Byline: Jonathan Takiff

Jan. 26--Neil Drucker got into the record business the old-fashioned way and for the best of all possible reasons: simply because he loved the music. Now he's staging a fond farewell to his hobby-turned-business with an impressive, three-CD retrospective package and a release party concert tomorrow at the Tin Angel. It started with a Northeast Philadelphia music store, the Record Cellar, which Drucker opened in 1980 in the 6800 block of Bustleton Ave. From time to time, Drucker recently recalled, "customers who were also musicians would give us tapes of their own work." In 1988, one came in from a breezy, three-piece guitar-pop band from Horsham, Flight of Mavis, that really clicked with Drucker …