Crossover (song) definition

noun

(1) A path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other

(2) The appropriation of a new style (especially in popular music) by combining elements of different genres in order to appeal to a wider audience

"A jazz-classical crossover album"

(3) A voter who is registered as a member of one political party but who votes in the primary of another party

(4) The interchange of sections between pairing homologous chromosomes during the prophase of meiosis