Theoretical Girls was a New York band formed by Glenn Branca and Jeff Lohn that existed from 1977 to early 1979. Glenn Branca and Jeffrey Lohn were both songwriters for this band. The band did only about 20 shows (3 of which were in Paris). It released one single which had some attention in England where it sold a few thousand copies. The band was never signed by a record company. The Theoretical Girls were among the most enigmatic of the late '70s New York no wave bands