Stephen Bruner’s fourth album as Thundercat is shrouded in loss—of love, of control, of his friend Mac Miller, who Bruner exchanged I-love-yous with over the phone hours before Miller’s overdose in late 2018. Not that he’s wallowing. Like 2017’s Drunk—an album that helped transform the bassist/singer-songwriter from jazz-fusion weirdo into one of the vanguard voices in 21st-century black music.