- The SDASA Chorale -- The Sealand Poets
- The Seamonkees -- The Seattle Brass Ensemble
- The Seattle Harmonic Voices -- The Secondary Modern
- The Seconds -- The Secret Show
- The Secret Show -- The Sedates
- The Seddonists -- The Seething Brunswicks
- The Segments -- The Sellick Manouver
- The Sellouts -- The Senile 1
- The Senior Allstars -- The Sense Offenders
- The Senseless -- The Seraph Choir
- The Seraphim String Quartet -- The Servents
- The Service -- The Seven Dials Band