Yet another new word for me, this time originating from the Italian language:

OBBLIGATO (pronounced ahb-lee-gah-tow) or OBBLIGATI (pronounced ahb-lee-gah-tee) as a noun, means an instrumental part, typically distinctive in effect, that is integral to a piece of music and should not be omitted in performance. There are four ways to spell this and two equally accepted ways to pronounce it. Used in a sentence as an example, it could be said "I truly loved the placement of the obbligato in this concerto."