Christian McBride Doghouse DocumentaryFollowing up his excellent 2019 documentary, Beneath the Bassline, Nick Wells takes a deep dive into the art, science, and history of the upright bass in jazz for Walking the Changes. The 113-minute film, which unflolds at the comfortable pace of a mid-tempo standard, features a who’s-who of the instrument talking about their craft and their influences. This is augmented by archival footage and punctuated by a handful of intimate performances. From the downbeat, players like John Patitucci, Dave Holland, Christian McBride, and Ron Carter deliver pearls of wisdom. McBride offers, “My plan is to play as many roots as possible because that’s what gets you work.” While Carter advises, “Be comfortable with the idea that if you don’t solo all night it’s really okay.” WDR Big Band bassist and Bass Magazine columnist John Goldsby plays a key role in framing the early history of the instrument, when it moved from a two-beat role in New