Hello Freediver, first let me congratulate you on the decision to expand your live concert genre. One suggestion is to avoid "overthinking" this new experience. The most notable and most obvious contrast will be that you'll hear the purity of the artists,the instruments and the music. No electronic enhancements such as amps, equalizers, mixers, dynamic lighting, speakers, etc. Also be prepared for a much lower SPL than you've encountered at rock concerts where the SPL averages 90 to 120 dBs. Live classic concerts SPL averages around 70-90dBs (much less stressful on the ears) with a few loud passages approaching 100 dBs. I enjoy every musical genre but especially so when the musicians are truly talented. Arrive early and take you seat so that you can listen to the artists warm up. This will also help prepare you for a marvelous first time experience. Enjoy the music.