Saxophone, Strings, Sousaphone, Soprano Clarinet, Sistra, Slit Drum, Stamper, Soda Bottle, Scrub Board, Stones, Shell Trumpet, Skin Drum, Shofar, Saxhorn, Sackbut, Serpent, Sheng, Sho, Sitar, Snare Drum, Synthesizer, Slide Whistle, Samponia, Shakuhachi, Shinobue, Shvi, Siku, Suling, Subcontrabass Flute, Saxonette, Soprillo, Sopranino Saxaphone, Subcontrabass Saxophone, Sarrusophones, Sopranino Sarrusophone, Soprano Sarrusophone, Sea Shell, Shawm, Sralai, Suona, Surnay, Subcontrabass Tuba, Sanza, Saenghwang, Siren, Slide Guitar, Steel Guitar, Seven-String Guitar, Sallameh, Sanshin, Santoor, Sanxian, Saung, Saw sam sai, Saw, Saz, Se, Shamisen, Setar Lute, Stroh Violin, Sopranino Mandolin, Sabar, Sampho, Surdo, Splash Cymbal, Shekere, Singing Bowl, Spoons, Steelpan, Sampler, Synclavier, Suikinkutsu, Shishi odoshi, Sea Organ
spockenspiel
Saxaphone Saxaphone
I can think of saxophone, sousaphone
(a kind of tuba worn over your shoulder),
snare drum (is side drum another name for a
snare drum?), shakuhachi (a Japanese vertical
flute or recorder 1 and 8/10 of a foot long), and
samisen (a banjo-like Japanese stringed instrument
sometimes called shamisen) off the top of my head.
Any others?