The sons of Korah (also descendants of Kohath) were descendants of a Levite who rebelled against Moses – Numbers 16.
This group of Levites were given the ministry of
… lead[ing] the music at the house of the LORD after the Ark was placed there. They ministered with music at the Tabernacle until Solomon built the Temple of the LORD in Jerusalem. They carried out their work, following all the regulations handed down to them.
1 Chronicles 6:31-32 NLT