The canon Simon & Garfunkel constructed -- "The Sound of Silence," "Mrs. Robinson," "Bridge Over Troubled Water," "Cecilia" -- is sturdy, and their harmonies surely were a marvel (whether they will be still remains to be seen; both are 61). Does this tour mean that Simon has renounced the innovative but commercially fatal path he took with "The Capeman"? Does it mean that Garfunkel will return to the movies? Leave it to the celebrity press to speculate. Suffice it to say that this hardy rock brand, supported by a two-CD Old Friends extension from Sony Legacy, will warm the cockles of baby-boomer hearts.