tandy's keyboards would be an integral part of elo's sound, and included piano, minimoog, clavinet, oberheim, wurlitzer electric piano, mellotron, yamaha cs-80, arp 2600, and harmonium. he was also proficient on guitar. on some albums he is also credited with vocals or backing vocals, without any specification of which songs. tandy was jeff lynne's right-hand man in the studio and co-arranged the strings with lynne and louis clark from "eldorado" onwards.