In this case familiarity does not breed contempt. Listen to the music you like and recordings you know. Hopefully, you like a variety of music so that you will be able to ascertain a components full range. I hold a singular opinion that you should develop a set list and adhere to it to limit variables in all your auditioning and that you should do it in a known acoustic environment (preferably your own listening room) while changing only one component at a time. In the end, since most amplifiers are more than competent these days, whatever strikes your subjective fancy will be the winner, so why fret. So called "classical" music is still the best IMHO, but if you can't stand it what is the point? Human singing voice, both male and female, human speaking voice, both male and female, strings (violin, viola, cello) will provide various cues, percussion, bass (and 1812 cannon shot if you like those, ah!) should round it out, small ensembles and large orchestras. Strangely enough. listening to a couple of poor recordings can set a kind of baseline in your ear/mind, helping you hear the better ones by contrast. Don't overwhelm your ear/brain processor with too extensive a listening session.
