Alegrías (Spanish pronunciation: [aleˈɣɾi.as]) is a flamenco palo or musical form, which has a rhythm consisting of 12 beats. It is similar to Soleares. Its beat emphasis is as follows: 1 2  4 5  7 9  11 . Alegrías originated in Cádiz. Alegrías belongs to the group of palos called Cantiñas and it is usually played in a lively rhythm (120-170 beats per minute). The livelier speeds are chosen for dancing, while quieter rhythms are preferred for the song alone.
One of the structurally strictest forms of flamenco, a traditional dance in alegrías must contain each of the following sections: a salida (entrance), paseo (walkaround), silencio (similar to an adagio in ballet), castellana (upbeat section) zapateado (Literally “a tap of the foot”) and bulerías. This structure though, is not followed when alegrías are sung as a standalone song (with no dancing). In that case, the stanzas are combined freely, sometimes together with other types of cantiñas.
Also, you can listen “Mar Amargo” from Camarón and “La Tarde es Caramelo” from Vicente Amigo.
It is one of the cante chico forms of flamenco. The word Alegrías literally means “joys.”