Article: Atkins, a former member of Cybotron, released Model 500 "No UFOs" in 1985, which became a regional hit, followed by dozens of tracks on Transmat, Metroplex and Fragile. One of the most unusual was "Strings of Life" by Derrick May, a darker, more intellectual strain of house. "Techno-Scratch" was released by the Knights Of The Turntable in 1984 which had a similar techno sound to Cybotron. The manager of the Factory nightclub and co-owner of the Haçienda, Tony Wilson, also promoted acid house culture on his weekly TV show. The Midlands also embraced the late 1980s house scene with illegal parties and more legal dance clubs such as The Hummingbird.

Question: what unusual single did derrick may release, featuring a darker strain of house?
"Strings of Life"