2018 is already shaping up to be a great year for music documentaries; one such movie, Elvis Presley: The Searcher, recently debuted on HBO to rapturous notices.  Soundtracks to two more probing films are on the way from Universal  On June 8, the label will deliver both Eric Clapton: Life in 12 Bars and Beside Bowie: The Mick Ronson Story. No single compilation can successfully capture the entirety of Eric Clapton’s remarkable career, though many from various labels have tried.  Life in 12 Bars takes a different approach, featuring 32 tracks on…