[Super Metroid] What is the name of the musical instrument used in Brinstar (The Jungle Floor), and is it used in any other video game music?

The instrument comes in right at about the 7 second mark and remains throughout the rest of the track. Not the chello sounding one, but the other.

The entire OST for Super Metroid is so nostalgic for me, but this song is definitely the most. When I think about it, this instrument is so unique sounding, I think it adds a lot to why I find this musical piece so unique as well.

The whole composition is just so incredible to me. Kenji Yamamoto is a living legend.