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Noun That questionable part of a musical performance that should be discarded for the future as unusable remains.

It is best to discard the acoustic ash and not spend additional time on material that does not garner attention and support from the crowd, allowing you to focus on the quality material that you perform and that conveys well.

Acoustic ash can also be described as the filler material that adds little value to a performance, but that can be "burned through" such as songs that almost anyone with a guitar can cover.
“That new cover song that went over like acoustic ash causing people to look pained when I tried to hit the high notes.”

“By the time I hit my fifth slow song at the coffee shop, I knew I was making acoustic ash and needed to pick things up before I lost my crowd.”
by Solerten March 05, 2018
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