ציטירנדיקער פּירוש אויף תהילים 49:1

But the sons of Korach did not die. The testimony to this is Shmuel and his sons and sons’ sons, who were the singers (see Divrei HaYamim I 6:18-22), and they were called the Korachites (Divrei HaYamim II 20:19), also: “For the conductor, by the sons of Korach, a song” (Tehillim 49:1). Additionally, in the Torah it is written (v. 58) “and the Korachite family” as well. Scripture mentioned the sons of Korach together with the sons of Reuven because all the sons of Dasan and Aviram died, even the minors. Thus, the evil that befell Dasan and Aviram was worse than that of Korach.