For me the best time in music was the 70s. You had the perfect combination of guitar heroics, epic, orchestral pieces, the absurd, awesome jazz, memorable pop songs (though pop's time to shine was the 80s). As xkcd put it, "the baby boomers are kicking our asses. We need to get it together guys." You listen to the radio nowadays and you'll never hear a song that you know will approach "Stairway"/"Smoke on the Water"/"Don't Stop Believin'" status. Back then you could turn on the radio and hear something good, or at least I think so, since I wasn't alive back then.
But that's why everybody here listens to bands that no one's ever heard of, amirite?
The greatest music moment for me personally was seeing Rush for the first time on June 26th, 2006. My girlfriend and I had just broken up as she was going to London for a month and just didn't feel like keeping in touch (this was all but said). Two days before the concert I saw an ad for Rush at Walnut Creek. My favorite band at the time, Dream Theater, was heavily influenced by Rush, so I asked one of my friends if he was interested in seeing them. I had only heard Moving Pictures and only knew the big hits from that album, aka side 1, and since my friend was going with a few of his pals I decided to tag along. Oh my God what a show. Here were three 50-60-year-old guys going out there with all the energy in the world giving everyone the experience as if it was their last show ever. The crowd was singing along as soon as they heard the beginning chords to "Limelight," and the Peart-wannabees air-drumming to every tune. I hadn't heard most of their material, but songs like "Natural Science," "Digital Man," "Malignant Narcissism," and "Freewill" blew me away the first time I heard them. Especially in a live setting. It was impossible for me NOT to get sucked into the atmosphere of South Park, Chicken Rotisseries, and rock 'n roll, forgetting any other troubles at the time. The next day I went out and bought 2112, Permanent Waves, and Hemispheres, filling in the gaps of last night's set in iTunes mp3s and listened to that set list for a good while. I have almost the entire discography now and to this day they are, in my mind, the greatest band in the world. After three years, Geddy inspired me to pick up the bass, and "Limelight" was the first song I set my sights on learning. When I hear a band for the first time and the first thing I think is, without any "maybes" or "interestings" or "this seems like a grower...", that's how you know how special that band is. All of my favorite bands are like that, its just that none of them have really came into my life guns blazing like Rush did.