Ella Fitzgerald's voice was satin to Louis Armstrong's sandpaper, but when you put them together on a single song, their chemistry was unimpeachable. This disc selects highlights from the three albums they made together at Verve (including their Porgy and Bess), and adds a spiffy live track from the Hollywood Bowl. Though they don't harmonize much (Armstrong's voice wasn't built for harmony), Ella's dignified swing and flashes of teasing wit play off Satchmo's gritty, good-humored roar symbiotically. The material is mostly lightweight Tin Pan Alley stuff (lots of Gershwin, plus the likes of "I've Got My Love to Keep Me Warm"), and they fly it like a kite. --Douglas Wolk