O.T. Quartet is an alias of Rollo Armstrong, the older brother of Dido, and half of the producer/mixer team Rollo and Sister Bliss.
The 1994 single Hold That Sucker Down was the only track released under this guise. Other names used during the period include Rollo Goes Camping, Rollo Goes Mystic, and Rollo Goes Spiritual. All these were on Rollo's own label, Cheeky Records.

Read more about O.T. Quartet on Last.fm.