Definition and background:
The barcarola is the style of music sung by the gondoliers in Venice, Italy or any music that is created in this style. The music is typically in 6/8 or 12/8 meter to simulate the motion of the boat moving through the waves of the water with the rhythmic rowing of the gondolier. There are many instances of the barcarola in vocal music, within opera and also a number of compositions for piano.Also [Fr.] barcarolle, [It.] barcarole, [It.] barcaruola.
For more information on the music term "Barcarola" check out these other resources:
Wikipedia - Glossary of Musical Terminology
Virginia Tech Multimedia Music Dictionary
ORB -- Medieval Music Glossary