Michael Gruber always loved the song craft of great writers like Lennon and McCartney, Greg Brown and Bob Dylan. But another love, for fingerstyle guitar music, grew from the drop a needle in the well worn groove of Leo Kottke's Green House and Mudlark lps. His first cd, Yesterday Is Make Believe, is an easy swinging collection of folk with R&B leanings, pop songs and finger-style acoustic artistry