I agree with Vitaly, Russian romantic orchestral music is very high on my list. I have no access (or money) for live orchestra, but I think those who do would love Taneyev's Symphony No. 2 (even if finished by someone else), and any music by Kalinnikov. Then, entering another "high on my list" musical realm, romantic French music, I can't imagine a live performance of either of Marie Jaell's piano concertos would not be a peak experience for anyone lucky enough to hear it.