The crumhorn is a musical instrument of the woodwind family, most commonly used during the Renaissance period. In modern times, particularly since the 1960s, there has been a revival of interest in early music, and crumhorns are being played again. It was also spelled krummhorn, krumhorn, krum horn, and cremorne.

The name derives from the German 'Krumhorn' meaning 'bent horn'. This relates to the old English 'crumpet' meaning curve, surviving in modern English in 'crumpled' and 'crumpet' (a curved cake).

The crumhorn is a capped reed instrument. Its construction is similar to that of the chanter of a bagpipe. A double reed is mounted inside a long windcap. Blowing through a slot in the windcap produces a musical note. The pitch of the note can be varied by opening or closing finger holes along the length of the pipe. One unusual feature of the crumhorn is its shape; the end is bent upwards in a curve resembling the letter 'J'. The curve is decorative only and does not influence the sound.

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