klez·mer 
(kl
ĕz
m
ər)
n. pl. klez·mo·rim (kl
ĕz
′m
ə-r
ēm
)
1. The traditional music of the Jews of eastern Europe, played by small traveling bands.
2. A musician in such a band.
[Yiddish, from Mishnaic Hebrew kəlê zemer, musical instruments : kəlê, pl. bound form of kəlî, instrument; see kll in the Appendix of Semitic roots + zemer, music, song; see zmr in the Appendix of Semitic roots.]