A few months ago, this writer was fortunate enough to catch a great “classic rock” concert in Jacksonville, Florida: Co-headliners Judas Priest and Deep Purple, with one of rock’s top up-and-coming bands The Temperance Movement as the opener. As 8,000 people sang along to such classics as Priest’s “You’ve Got Another Thing Coming” and “Livin’ After Midnight” and Purple’s “Smoke on the Water,” those moments were tinged with a bittersweet taste. Why? Because Deep Purple has announced this as their final tour, while Priest may be near the end of their long career (with only two original members left). In fact, “final” tours have become the norm over the past few years, as bands like Mötley Crüe, Black Sabbath, Ozzy (as a solo artist) and KISS have announced their retirements as touring bands.