Concerts are one way of rating the bands we loved. I for one, hate concerts since I grew up (did I?) and never really was one to get the buddies to go on a road trip to go see any of our favorites. Sometimes it was a no brainer and we drank, smoked some bones and said "wow that was great" even though sometimes it wasn't. Saw Queen, great "show" I guess but they weren't anything I would fall for. Saw Pink Floyd in NJ and didn't really like them but really like the lovely lady who brought me - later in life when I bought my son to his first concert "Australian Pink Floyd" I suddenly grew a liking to their music and now stop on it almost always when on Sirius.
To me music has always been more for cruising in the car, relaxing at a party to the house or just flat out partying somewhere. 8 tracks VHS, cassettes, turntables, car stereo with Jensen's humming out from a Blaupunkdt stereo system with the T-Tops off. So what they do in the studio is where I rate them and hell they're all really good, some a bit too much studio. But for me it's the hard rock sound of a Deep Purple, Led Zeppelin, Grand Funk and so many others that have kept my car going during travel. I love some of the 60's, 70's for sure from the one hit wonders and such, and the newest stuff I can go with is STP, Pearl Jam and a couple others but I will always fall back on the 60-70 rockers who impacted my musical interest.