Say you like to sing. In fact, say you really like to sing, so much so that you warble not just in the shower but on Broadway (winning two Tonys in the process). Say you’re James Naughton, in which case this applies. Where do you go to get some recordings of the other greats of stage and screen? “I’ve been going to Colony Records (1619 Broadway, at 49th Street; 265-2050) for 25 years,” says Naughton, “and they have a level of service you don’t find at any of the other record stores.” Now in its fiftieth year, Colony has provided plenty of show-tune addicts their fix for the obscure cast album. “People come in, they have a lyric to a song, they don’t know who’s done it, but they know ‘love’ is in the title,” says owner Richard Turk of Colony’s service-intensive approach. “We make sure they walk out with the song.”