Thor Baldursson is an Icelandic composer, organist, arranger and producer. He is best known for his work with Giorgio Moroder, and records with Donna Summer, Grace Jones and Elton John. The 1978 Disco-funk track Sing Sing by his band Gaz became a sought after sample, its rhythm appearing on a number of hits to this day, giving Baldursson songwriting credits on tracks by Drake, Dua Lipa, Kylie Minogue and more. That sample is the foundation block of the Baltimore Club genre of music.