Delaney and Bonnie Bramlett were a husband-and-wife team whose soul- inflected rock earned them an admirer in Eric Clapton — the guitarist even credited Delaney for giving him the confidence to sing. Cut at London's Royal Albert Hall while the Bramletts were touring with Clapton in 1969, this live album featured wicked performances of the kind of country and boogie that would define Southern rock. The four-disc reissue includes the entire concert plus songs from later nights. The 52 tracks catch the musicians — a who's who of Clapton-related players, including George Harrison — at their peak. Bonnie's wailing, powerhouse vocals steal the show on R&B burners like "That's What My Man Is For," and some of the best songs here are ones that didn't fit onto the original vinyl album — including Clapton's heartfelt "I Don't Know Why."

“Help Me”

Joni Mitchell wrote and recorded this song for her album Court and Spark, but she had to switch from her regular band to make the song sound exactly the way she wanted. "I had attempted to play my music with rock & roll players," she told Rolling Stone. "They’d laugh, 'Awww, isn't that cute? She's trying to teach us how to play.'" Mitchell switched to a jazz band, Tom Scott’s L.A. Express, and scored the biggest hit of her career in the process.