A technique where the sculptural elements remain attached to a solid background of the same material is called:

Relief

Explanation: Relief is a sculptural technique where the sculpted elements remain attached to a solid background of the same material. The term relief is from the Latin verb relevo, to raise. To create a sculpture in relief is to give the impression that the sculpted material has been raised above the background plane.

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the style of music that was composed during the classical era was concerto grosso.