The frame which is held in position by being slid beneath the piano keyboard has two uprights (1) with a horizontal bar (2) between them and with an adjustable screw attachment (3) to each upright (1) so that the spacing between the latter is adjustable. Tow threaded rods (4) connect the two uprights horizontally, with the rods (4) being adjustable both vertically and horizontally, and two adjacent pedals (11) attached to each of the rods (4). each upright (1) has an inner tube (8) which is spring biased upwards, and which has a rubber stop (10) at the upper end for contacting the underneath of the piano keyboard. The pedals (11) are attached to springs (16) for returning them to the rest position after they have been depressed.
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