The great improvement of this age in the manufacture of the piano-forte is the Dolce Campana Attachment, invented by Mr. Jas. A. Gray, of the firm of Boardman & Gray, and patented in 1848 not only in this country, but in England and her colonies. It consists of a series of weights held in a frame over the bridge of the piano-forte, which is attached to the sounding-board; for the crooked bridge of the piano, at the left hand, is fast to and part of the sounding-board. The strings passing over, and firmly held to this bridge, impart vibration to the sounding-board, and thus tone to the piano. These weights, resting in a frame, are connected with a pedal, so that when the pedal is pressed down, they are let down by their own weight, and rest on screws or pins inserted in the bridge, the tops of which are above the pins that hold the strings, and thus control the vibrations of the bridge and sounding-board. By this arrangement, almost any sound in the music scale can be obtained, _ad libitum_, at the option of the pianist; and as it is so very simple, and in no way liable to get out of order, or to disturb the action of the piano, of course it must be valuable. But let us listen for ourselves. We try one of the full rich-toned pianos we have described, and, pressing down the pedal, the tone is softened down to a delicious, clear, and delicate sweetness, which is indescribably charming, "like the music of distant clear-toned bells chiming forth their music through wood and dell." We strike full chords with the pedal down, and, holding the key, let the pedal up slowly, and the music swells forth in rich tones which are perfectly surprising. Thus hundreds of beautiful effects are elicited at the will of the performer. This Dolce Campana Attachment is the great desideratum which has been required to perfect the piano-forte, and by using it in combination with the other pedals of the instrument, the lightest shades of _altissimo_, alternating with the _crescendo_ notes, may be produced with comparative ease. Its peculiar qualities are the clearness, the brilliancy, and the delicacy of its touch. Those who, in the profession, have tested this improvement have, almost without an exception, given it their unqualified approbation; and amateurs, committees of examination, editors, clergymen, and thousands of others also speak of it in terms of the highest praise. Together with the piano-forte of Messrs. Boardman & Gray, it has received ten first class premiums by various fairs and institutes. And we predict that but a few years will pass ere no piano-forte will be considered perfect without this famous attachment.