​BOLERO. A brisk Spanish dance in 3-4 time. The earliest form of its rhythm was

which later became

while to the longer notes of the accompaniment shorter melody notes were given, and vice versá. Gradually the rhythm of the castanets, which were used as an accompaniment to the dance by the dancers themselves, was introduced into the music, which now assumed this form

The bolero usually consists of two chief parts, each repeated, and a trio. The castanet rhythm above referred to mostly commences at least one bar before the melody. Good examples of the bolero may be found in Méhul's 'Les deux Aveugles,' Weber's 'Preciosa' (gipsy-ballet), and Auber's 'Masaniello.' We give the opening of the last as an illustration