Tom Moon

Since its premiere in 1918, Gustav Holst's symphonic cycle The Planets has effectively defined the informal genre of "music about space." But more recently, four prominent artists from different musical realms collaborated on a cosmic exploration of their own. It culminated in Planetarium, which was released earlier this month.

Stephen Bruner is a bass player, singer and songwriter who's as well known for his own music as for his collaborations. But when he released his latest solo single as Thundercat few weeks ago, those who know his work with Kendrick Lamar were scratching their heads. Here was a fiery visionary collaborating with two icons of easygoing '70s pop: Kenny Loggins and Michael McDonald.

Over the years, music fans have slowly filled in details about a hard-working, mostly anonymous collective of Detroit studio musicians known as The Funk Brothers, who were the backing band for many of Motown's hit songs. Less documented is what these musicians did when they were not in the studio.

Every so often, you run across a collection that opens up an entirely new way to think about an artist. Jack White's new, 26-track retrospective, which focuses on his unplugged, less raucous songs, does just that. The unreleased songs, album tracks and B-sides that make up Jack White Acoustic Recordings, 1998-2016 offer a fresh window onto the work of the creative, prolific rock musician.

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