In the song dont stop believing- what style does the song represent? what musical elements of the song to identify its style?

If you are talking about Don’t Stop Believing by Journey, I believe that the style demonstrated in the song is either Classic Rock or Rock. (I would lean more towards Classic Rock.) The musical elements in the song that represent the style are for instance the guitar solos, and the instruments used. (Vocals, guitar, drums, etc.) Also the format, in which the main theme comes back at the end to close out the song. Hope this helps! :)

Concerto grosso was composed during the classical era. (sorry if i misspelt the name)