There is a Gemoro in Chagiga (15a) that talks about Elisha Ben Avuyo (Acher) who was a great tzaddik but ended up going off. Though i cant find it there – the gemoro does say that the reason (or at leats one of them) he went off was because lo posak.. (cant remember middle words) mipumi. because he used to sing non jewish songs on a regular basis……… i hope this helps, i will continue to look into it and let you know exact details b”n.
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