bandstand n.

"an organized group," originally especially of armed men, late 15c., from French bande, which is traceable to the Proto-Germanic root of band (n.1), perhaps via a band of cloth worn as a mark of identification by a group of soldiers or others (compare Gothic bandwa "a sign"). But perhaps it is rather from Middle English band, bond in the sense "force that unites, bond, tie" (late 14c.). Also compare Old Norse band "cord that binds; act of binding," also "confederacy."

The extension to "group of musicians" is c. 1660, originally musicians attached to a regiment of the army and playing instruments which may be used while marching. To beat the band (1897) is to make enough noise to drown it out, hence to exceed everything. One-man band is recorded by 1931 in the sense of "man who plays several musical instruments simultaneously;" the figurative extension is attested by 1938.

Old English stand "a pause, delay, state of rest or inaction," from the root of stand (v.). Compare Dutch and German stand (n.). Sense of "action of standing or coming to a position" is attested from late 14c., especially in reference to fighting (1590s). Sense of "state of being unable to proceed" is from 1590s.

Meaning "place of standing, position" is from early 14c.; figurative sense is from 1590s. Meaning "raised platform for a hunter or sportsman" is attested from c. 1400. Meaning "raised platform for spectators at an open-air event" is from 1610s; meaning "piece of furniture on which something is to be set" is from 1690s. Sense of "stall or booth" is first recorded c. 1500. Military meaning "complete set" (of arms, colors, etc.) is from 1721, often a collective singular. Sense of "standing growth" (usually of of trees) is 1868, American English. Theatrical sense of "each stop made on a performance tour" is from 1896. The word formerly also was slang for "an erection" (1867).