A bass drum having a curved side wall and two heads, sound muffling means comprising a pillow having longitudinally spaced opposite ends and length between the ends greater than the spacing between the heads; the pillow having lateral width which decreases away from each of the opposite ends toward the center of the pillow; the pillow having a surface which is outwardly and widthwise convex along the pillow length to engage the drum curved side wall of the inner side thereof, as the pillow is endwise compressed by engagement of the pillow opposite ends with the heads.
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