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My friend said:
うたっちゃだめだから。
Is the っちゃ a colloquial replacement for っては in this case?
Precisely.
In meaning,
「ては」＝「ちゃ」, 「ちゃあ」.
Thus,
「うたっちゃだめだから。」
means:
"You shouldn't sing (it/this song/here/now, etc)."
