For a few years in the halcyon days of the sixties, Tommy Boyce and Bobby Hart were on top of the world. Singers, songwriters and producers, Boyce and Hart - individually or collectively - were behind some of the most enduring hits of that era or any other: "Last Train to Clarksville," "(I'm Not Your) Stepping Stone," "Come a Little Bit Closer," "Hurt So Bad," "I Wanna Be Free," "Valleri," "Pretty Little Angel Eyes," and of course, the immortal "Theme from The Monkees." As if turning out hits