After tea, we discussed a variety of topics before the fire; and Mrs. Micawber was good enough to sing us (in a small, thin, flat voice, which I remembered to have considered, when I first knew her, the very table-beer of acoustics) the favourite ballads of ’The Dashing White Sergeant’, and ’Little Tafflin’.
There are no more uses of "acoustic" in the book.
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She plays an acoustic guitar.
Then this guy—he couldn’t have been any older than Kyle—walked out onto the stage wearing a fedora and holding an acoustic guitar.