This varied and appealing collection gathers tracks from different periods of Armstrong's career and features accompaniments ranging from medium-sized orchestra to smaller combos with a loose improvisatory feel. The earliest recordings, from 1929 and 1930 (and with Tommy Dorsey on trombone), are excellent--including "When You're Smiling" and "Body and Soul." Jumping ahead nearly 20 years to the middle-late 1940s, the collection also focuses on the recordings Armstrong made with his Allstars on such numbers as "Black and Blue," "Jelly Roll Blues" and the title track, which showcases a wonderful scat solo.