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Wiktionary
montuno

n. (context music English) The counterpoint in Cuban salsa music.

Wikipedia
Montuno

Montuno has several meanings pertaining to Cuban music and its derivatives. Literally, montuno means 'comes from the mountain', and so Son montuno may refer to the older type of son played in the mountainous rural areas of Oriente. Another possibility is that the word "Montuno" comes from the word "Montura" which is the Spanish word for "Saddle", because the rhythm in Son music is like riding a horse. Or it may mean the final section of a song-based composition; in this sense it is simply part of a piece of music. Here it is usually a faster, brasher, semi-improvised instrumental section, sometimes with a repetitive vocal refrain. Finally, the term montuno is also used for a piano guajeo, the ostinato figure accompanying the montuno section, when it describes a repeated syncopated piano vamp, often with chromatic root movement.

Montuno (song)

"Montuno" (Montuno) was the fourth single released by Gloria Estefan from her first Spanish album Mi Tierra. The song saw a UK release only as "Mi Buen Amor" and Si Señor... were released simultaneously as the album's fourth single in Latin America and Europe respectively.