Who? (1973)

Big Walter Horton was one of the key architects of modern blues harmonica. Blues legend Willie Dixon referred to him as "the best harmonica player I ever heard." Along with Little Walter Jacobs and Sonny Boy Williamson II, he is considered to be one of the most influential harpists ever. He was capable of both intense power and fragile delicacy, often in the same song. He was endlessly melodically adventurous, and always unpredictable. His only Alligator Records album, - "Big Walter Horton With Carey Bell", came out in 1972. It paired him with his young protégé, who had played under Walter's tutelage since Bell's arrival in Chicago. Walter's long-time partner Eddie Taylor joined them on guitar. It was Alligator's second-ever release, and received widespread critical acclaim, especially for the fiery harp duets that pitted the two harmonica masters against one another.

Gram Parsons - GP (1973). GP is American singer-songwriter Gram Parsons' debut solo album. Working with a crack band of L.A. and Nashville's finest (including James Burton on guitar, Ronnie Tutt on drums, Byron Berline on fiddle, and Glen D. Hardin on piano), he drew from them a sound that merged breezy confidence with deeply felt Southern soul, and he in turn pulled off some of his most subtle and finely detailed vocal performances; "She" and "A Song for You," in particular, are masterful examples of passion finding balance with understatement. Parsons also discovered that rare artist with whom he can be said to have genuinely collaborated (rather than played beside), Emmylou Harris; Gram and Harris' spot-on harmonies and exchanged verses on "We'll Sweep out the Ashes in the Morning" and "That's All It Took" are achingly beautiful and instantly established her as one country music's most gifted vocalists…

Released when Mercury Records was still located in Chicago, IL, back in 1973, the second album from Bachman-Turner Overdrive was the first to break through in a big way. First the hit single "Let It Ride" went Top 25 circa March of 1974, then the anthem "Taking Care of Business" went Top 15 the summer of that year. By October they would top the charts with "You Ain't Seen Nothing Yet" from the follow-up LP, 1974's Not Fragile, but their seven chart songs were all made possible by this album and these two songs, "Let It Ride" and "Takin' Care of Business," in particular. "Let It Ride" features one of C.F. Turner's best vocals; keeping that gargle-with-Draino diesel sound down to a minimum, the song has two major guitar riffs, one a strum, the other from Led Zeppelin's 1970 "Immigrant Song," an inverted mutation of Randy Bachman's own "American Woman" riff which also hit in 1970.

How does an instant multimillion-selling album become an underrated minor masterpiece? George Harrison's follow-up to the triple-disc All Things Must Pass (which had been comprised of an immense backlog of great songs that he'd built up across the last years of his time with the Beatles), Living in the Material World was necessarily a letdown for fans and critics, appearing as it did two-and-a-half-years after its predecessor without that earlier album's outsized songbag from which to draw…

By January 1973, Eric Clapton's career was going great guns as the result of compilations like History of Eric Clapton; the only problem was that Clapton himself was nursing a heroin addiction and hadn't been heard from since his August 1971 appearance at the concert for Bangladesh…