An idiom is an expression, word, or phrase that has figurative meaning — its implication comprehended only through common use; whereas the literal definition of the idiom, itself, does not communicate its meaning as a figurative usage.
Idioms usually do not translate well; in some cases, when an idiom is translated into another language, either its meaning is changed or it is meaningless.
Unfortunately or fortunately, in order to become acquainted with the idiom of country or rock music, it is necessary to occasionally play in a bar. Bars are a rehearsal place. Garth Hudson
Yes, but I view Frank's music as fully composed. In other words, the arrangements can work for any idiom such as a rock band or an orchestra. Frank was a brilliant arranger and could make his music work in any context. He proved that tour after tour and album after album. Dweezil Zappa