Wed. 3/07 10a: "Opera 201," a four-hour session on the art of opera for both aficionados and neophytes, is presented on March 17 in Steiren Hall at the Santa Fe Opera. Spencer Beckwith speaks with singer, teacher and director, Kathleen Clawson, one of the leaders of this follow-up to last year's "Opera 101," presented by the Santa Fe Opera Guild.