[1] He primarily plays keyboard instruments and is best known as a former member of British rock group Jethro Tull, for whom he was the longest serving keyboardist.

[2] Giddings began his professional music career in 1980, playing with the groups Profusion, The Chase, and The Brothers Grimm,[3] later forming his own band X-statique.

Later he recorded with various artists including Leo Sayer, Sniff 'n' the Tears, Vyktoria Keating, Willy Porter, and Jon Anderson of Yes.

[3] After leaving Jethro Tull, Giddings produced a solo album in 2010, Picture This, a collection of his keyboard and electronic music.

[4] Later he provided keyboard and orchestration services via e-sessions, and wrote and recorded music for film and television at his digital studio in Oxfordshire.