June is here, and that means that many of the major performing groups will be going on vacation. However, just as that happens, we have the Washington Early Music Festival most of this month, about which I’ll write more next week. This week, both of the area’s major symphonies are presenting major transcendant symphonies by Gustav Mahler, some of the most extravagant musical statements ever made. These works are not performed all that often, because…