 Following his audition , Jack ( Sean Hayes ) receives a call back and is informed that he has become a finalist for the Manhattan Gay Men 's Chorus . At the final auditions for the chorus , Jack is informed by the choral director that he will have a solo , but before he can sing it , Owen ( Matt Damon ) — originally intended for the solo part — barges in and sings his part . Jack sees Owen as competition and thinks of a way to get rid of him . He learns that Owen is posing as a gay man , after observing him gaze at a woman . Jack strikes a plan to get Owen to confess he is straight , in which he invites him to " rehearse " in Will and Grace 's apartment . Jack 's plan fails miserably , so he enlists the help of Grace ( Debra Messing ) to " in " Owen for him . Grace begins flirting with Owen , which ultimately leads to the two making out , prompting Jack to barge in and take a picture . Owen , however , tricks him into pulling the film out of the camera , destroying the proof . At the chorus rehearsal , Jack and Owen begin bickering , which results in Jack revealing to everyone that Owen is straight , to which Owen admits . Despite the revelation , the chorus director ( Patrick Kerr ) tells Owen he has made it into the chorus . 
