by Scott YanowImagine a group that consists of piano, bass, drums, and five to seven tubas. Howard Johnson, one of the mightiest tuba players of the past 30 years, has been leading Gravity since 1968 but this is their first recording. Despite the instrumentation, the group plays the music (which ranges from Don Pullen's colorful"Big Alice" and two of Johnson's originals to such standards as"Stolen Moments,""Yesterdays," and"'Round Midnight") with swing, creativity, and more variety than one might expect.