Concrete vs. Concerto

In philosophy, a concept is considered concrete if it is not abstract: it must be both particular and an individual, and hence occupy both space and time. To say that a physical object is concrete is to say, approximately, that it is a particular individual that is located at a particular place and time.
The etymology of the word "concerto" is somewhat problematic, as the Italian ‘concertare’ can mean ‘to contend, dispute’ but it also has the contrary meaning of ‘to agree’. The idea of two opposing forces is inherent in the use of the term.