Blessed (though also, in a way, cursed) with five singer&#amp;#150;songwriters and briefly groomed as San Francisco’s psychedelic Great White Hope, Moby Grape made only one blue–ribbon record — their self–titled 1967 debut — before molding faster than a strawberry. This one–hour distillation of their first four albums tries to make the case that their later stuff was just as good, and it nearly does: Their tight, terse arrangements and weightless harmonies remained more or less intact even after Skip Spence (who wrote their sole minor hit, “Omaha”) was committed to the psychiatric ward of Bellevue Hospital in New York, ending their first lineup’s splendid three–guitar tangle. But the drop–off in songwriting is precipitous (the two tracks from 1969’s imitation–country–Byrds Truly Fine Citizen are embarrassing), and any Moby Grape compilation without “Fall on You” or “Naked, If I Want To” is distinctly and curiously incomplete. Download: “Omaha,” “Hey Grandma”