“‘Rock & roll is electronic music – because if you pull the plug, it stops.’ So says Louis ‘Cork’ Marcheschi of Fifty Foot Hose, whose sole album, Cauldron – a pioneering collision of abstract electronics and psychedelic rock originally released in 1967 – was reissued for the first time on vinyl at the end of 2017. Marcheschi’s remark is a reissue too, in a way. He originally made that assertion early in ’67 when he and guitarist David Blossom were drunkenly hatching the idea for Fifty Foot Hose, as a rock group that ‘really incorporated the concepts of electronic music not as sound effects but as a substantive part of the music.’ Fifty Foot Hose weren’t the only ’60s rockers who’d had this lightbulb moment. Although these bands were largely unaware of each other’s existence at the time, you could group Fifty Foot Hose among a confederacy of acid-era bands…