Initiated by indie-rockers like Sonic Youth, Slint and Built to Spill at mid-2000s festivals - UK/U.S. hopover All Tomorrow's Parties and its various tie-ins being the most prominent - playing a beloved LP front to back in concert is now the hottest thing going on the classic-rock circuit. Within the next month, Houstonians can see Aerosmith revisit 1976's Toys In the Attic (The Woodlands, July 17), Judas Priest do 1980's British Steel (Verizon, July 24) and Motley Crue gas up 1989's Dr. Feelgoo