Every five or 10 years, someone in Nashville gets the good idea to stage this Stephen Sondheim classic, and why not? It wasn’t the show that put the ambitious composer/lyricist on the theatrical map — first there were West Side Story, Gypsy and A Funny Thing Happened on the Way to the Forum — but it resoundingly propelled him into the fertile era of the 1970s, with his many challenging and controversial efforts to follow, mainly Follies (1971), A Little Night Music (1973), Pacific Overtures (1976) and Sweeney Todd (1979). For many theatergoers, Company remains the most obviously accessible Sondheim opus, with its recognizable adult relationships and marital situations (book by George Furth) and linchpin lead character, Robert (Bobby) the bachelor, who deals with fear of commitment and his search for love. Back in 1970, critics and theatrical theorists wondered if Bobby was gay, and those ruminations persist since the show has had a production history with many gay males cast in the role. For the plot to fly, Bobby’s straightness becomes a very practical matter — but in 2012 maybe no one will even bother to wonder which way he’s swinging. But whichever way that is, Sondheim provided great songs: “Being Alive,” “The Ladies Who Lunch,” “Getting Married Today,” “Another Hundred People,” “Side by Side by Side,” and the sophisticated title-song opener. Director Paul Cook has gathered a really promising cast for this Circle Players production, including Mike Baum, Debbie Kraski, Geoff Davin, Lindsay Hess and Megan Murphy Chambers.