On the face of it, Grammy-winning R&B singer Leon Bridges and left-field alt-rock Khruangbin, led by guitar wizard Mark Speer, seem a very unlikely combination. But Bridges started pushing the boundaries of the vintage soul sounds of his 2015 debut, “Coming Home,” almost immediately, veering off into more organic, esoteric directions with the two albums he’s released since then — particularly his latest, “Gold-Diggers Sound” — and collaborating with everyone from Kacey Musgraves and John Mayer to Bun B and the Avalanches. Meanwhile, Khruangbin continued to refine their largely instrumental style of groove-based rock, occasionally adding vocals that, frankly, often feel like an afterthought.
Yet the two acts, who first met and began working up songs when they toured together in 2018, had two key things in common: They’re all proud Texans, with Bridges hailing…
