SOIS does not have a school song. I wish we did. I wish I could write one.
Three SIS graduates (class of 2001; I was one of their HR teachers) formed a band in high school called "Core of Soul." The lead singer wrote a song - "The Spirit of This Place" - to commemorate their graduation, and she performed it at the graduation ceremony with 2 classmates. The song is a sincere, heartfelt testament to the students' love of their school. And catchy, too, at least to this old man's ears. I consider this song, unofficially at least, as the SOIS school song.