(THEATER) The blues is the source of so much greatness in the black arts—the mystery novels of Walter Mosely, the literary novels of Ralph Ellison, the modern jazz of Thelonious Monk, and the dramatic poetry of August Wilson. The primary function of his plays is not the transmission of historic information, but the conversion of the blues into the highest condition of language. Radio Golf, the last installment of his 10-play survey of 20th-century black America, spreads the word and supplies the literary goods. (Seattle Repertory Theatre, 155 Mercer St, 443-2222. 7:30 pm, $10–$46.) CHARLES MUDEDE