With French drummer Pierre Moerlen, he reformed the jazz-rock group Gong. PM's Gong is considered one of the great fusion bands of the late 70s. Recording guests included icons like Mick Taylor, Steve Winwood and Didier Lockwood. International touring soon secured Hansford a place among the world's leading bass players and work with Mike Oldfield, Allan Holdsworth, John Martyn, Biréli Lagrène, La Monte Young, David "Fuze" Fiuczynski, Gary Husband etc. Hansford, with microtonal guitarist Jon Catler and Warwick bass guitars, developed the first Just Intonation bass.
He is considered an expert in the use of Just Intonation tuning systems. Hansford is a founding member of the band Gongzilla with guitarist Bon Lozaga. The new HRIII trio debuted in 2019 at the Festival Quebec Jazz en Juin.
He is heavily involved in the development of fretted instruments based on Just Intonation.
Hansford Rowe uses a Peterson V-SAM to tune his basses.