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Leket Yosher (pg. 106) writes that his teacher (the Terumat Hadeshen) would not say Zemirot during the three weeks, which would indicate that he held that a-capella music is forbidden during this t...
Answer
#2: Post edited
*Leket Yosher* ([pg. 106](http://www.hebrewbooks.org/pdfpager.aspx?req=8859&st=&pgnum=106)) writes that his teacher (the [*Terumat Hadeshen*](https://en.wikipedia.org/wiki/Israel_Isserlein)) would not say *Zemirot* during the three weeks, which would indicate that he held that a-capella music is forbidden during this time.
- *Leket Yosher* ([pg. 106](http://www.hebrewbooks.org/pdfpager.aspx?req=8859&st=&pgnum=106)) writes that his teacher (the [*Terumat Hadeshen*](https://en.wikipedia.org/wiki/Israel_Isserlein)) would not say *Zemirot* during the three weeks, which would indicate that he held that a-capella music is forbidden during this time.
- *Yosef Ometz* (A book on customs of Frankfurt am Main) writes ([601](https://hebrewbooks.org/pdfpager.aspx?req=41174&st=&pgnum=91)) that the *Zemirot* should be said softly, or in a tune which doesn't bring joy. This would indicate that it would be permitted (at least on Shabbos) provided that it doesn't bring to joy.
#1: Initial revision
*Leket Yosher* ([pg. 106](http://www.hebrewbooks.org/pdfpager.aspx?req=8859&st=&pgnum=106)) writes that his teacher (the [*Terumat Hadeshen*](https://en.wikipedia.org/wiki/Israel_Isserlein)) would not say *Zemirot* during the three weeks, which would indicate that he held that a-capella music is forbidden during this time.