In Nagauta (ballads sung to shamisen accompaniment), there are certainly tunes whose titles include sankyoku, such as "Sankyoku Ito no Shirabe" (The Melody of Sankyoku Strings) and "Sankyoku Sho-chiku-bai" (literally, Sankyoku Made Up of Pine, Bamboo and Plum Blossom), but the sankyoku embedded in their titles indicates not sankyoku gasso but the three kinds of instruments themselves.
長唄曲に「三曲糸の調」や「三曲松竹梅」があるが、これは三曲を指し、つまり三種の楽器を詠んだもので、三曲合奏の意味ではない。