The band's greatest success arrived alongside its greatest tragedy. Robbie McIntosh died of a heroin overdose at a Los Angeles party in 1974, just days after the album AWB had been released to massive acclaim. The band was devastated and came close to breaking up. McIntosh had been the engine of the rhythm section, and his loss could have ended the group entirely. They regrouped with Steve Ferrone on drums, released Cut the Cake the following year, and managed to keep the sound intact despite the personal loss. The tragedy gave their success a bittersweet edge that never fully faded.
Pick Up the Pieces is the one. Released in 1974, the instrumental went to number one on the Billboard Hot 100 and became one of the most recognizable funk tracks of the decade and beyond. The groove is built around a horn riff that locks into a pocket so deep it sounds effortless, and the rhythm section's precision made the track a favorite for every funk DJ and hip-hop sampler who followed in the years after. The album AWB sold over two million copies and established the band as one of the most successful white funk acts in history.

They influenced everyone from the Roots to the Brand New Heavies to Daft Punk. Their Scottish origin eventually became a point of pride rather than a curiosity, and the band continued touring and recording for decades after their 1970s peak.