Most artists would be happy with a single successful career. Not Mickey Hart. A drummer with the nearly mythic band Grateful Dead, Hart managed to escape the stasis that legends often devolve into by following a path of the spirit that led him to world music. The journey began with a friendship with Indian master drummer Zakir Hussain that spawned 1975's Diga Rhythm Band, an early experiment in worldbeat fusion. In addition to his ongoing role in continuations of the Dead, Hart's interaction with drummers from around the world sparked an abiding interest in the social and mythological role of the drum in other cultures and was documented on albums like 1991's Planet Drum, 2007's Global Drum Project, and 2022's In the Groove.

Hart originally joined the Grateful Dead in 1967 as its second percussionist. Three years later, he left the Dead to cut the solo album Rolling Thunder in 1972 (which featured various members of the Dead). Hart returned to the band in 1974 and stayed with them for their entire run, although his musical activities outside the Dead were extensive. In 1976, the Dead's Round Records label released Diga by the Diga Rhythm Band, an early experiment in worldbeat fusion put together by Hart. The years 1979 and 1980 saw the release of two albums of music from the film Apocalypse Now, much of it contributed by Hart.

In 1983, Hart released albums under the heading the World. These began with a reissue of Diga Rhythm Band, then came a series of albums of music Hart had recorded around the world. In 1989, Hart released Music to Be Born By, an album based on the heartbeat of his son in the womb, and 1990 saw the simultaneous release of Hart's first book, Drumming at the Edge of Magic, and an album, At the Edge. In 1991, another book and disc, both called Planet Drum, appeared. Both albums made the upper reaches of the new age and world music charts. Supralingua followed in 1998, and two years later, Hart returned with Spirit into Sound.

The year 2007 saw the release of Global Drum Project, co-billed to Hart with Zakir Hussain, Sikiru Adepoju, and Giovanni Hidalgo. Released on Shout! Factory, it won the Grammy Award for Best Contemporary World Music Album. The trio all appeared on Hart's next recording, 2012's Mysterium Tremendum, billed to the Mickey Hart Band and featuring seven songs written by Hart with longtime Grateful Dead lyricist Robert Hunter. One year later, Superorganism appeared with much the same lineup and included four songs with lyrics by Hunter. In 2017, Hart signed with Verve and delivered the album Ramu. In 2022, the album In the Groove surfaced, credited to the Planet Drum rhythm collective of Hart, Hussain, Hidalgo, and Adepoju. The group's first new music since 2007's Global Drum Project, it began as a remote recording collaboration in the early phases of the COVID-19 pandemic. When restrictions related to the pandemic began lifting, the drummers reunited in the studio and finished work on the album. ~ William Ruhlmann & Bob Tarte, Rovi