Progressive Rock act. Keyboard player Tony Lukyn is ex-HEADSTONE, the act that would evolve into RARE BIRD. Guitarist Kevin McCarthy was previously with CRESSIDA. Drummer Eric Dillon and bassist Leverton, both ex-FAT MATTRESS, would later form Hard Blues Rock act HEMLOCK for a 1973 album. Leverton later worked with JUICY LUCY before reuniting with Dillon in SAVOY BROWN. During 1980 Dillon was a member of LION.

TRANQUILITY's second album, 'Silver' released in 1972, found Leverton and Dillon deposed by drummer Paul Francis and bassist Bernard Hagley.

In later years Terry Shaddick would become a much in demand songwriter penning a plethora of Pop hits including OLIVIA NEWTON JOHN's number 1 'Physical'!