English: Zimran — for they made music in the world; Yokshan — for they became hard in the world. And the Rabbis say: Zimran — for they made music to idolatry; Yokshan — for they beat the drum for idolatry.
On the daf / in context: The names of Keturah’s sons are read as allusions to their later conduct; the midrash offers both a neutral and a critical etymology.
Type of Learning
Derash on the verse (midrash on names) — not a formal named middah of the 13: the names are treated as signals of character or practice.
What Is Learned
The names of the sons of Keturah are read as pointers to their ways: music and hardness, or, according to the Rabbis, music and drumming for idolatry.