Robert Altman's "Grand Hotel" is the Grand Ol' Opry; here he takes pot shots at the American Dream as it is scurried after by no fewer than 24 different characters. Much of the dialogue is improvised--as is the character development--by the actors themselves, which lends a feeling of collage to Altman's multi-leveled, mini-episodic style. The musical score--brilliantly integrated into this scheme--includes songs written and performed by the actors themselves. A veritable treatise on language and politics in the mid-Seventies, Nashville will undoubtedly remain, on seeing it today, what Pauline Kael's before-the-preview review dubbed it in 1975: "the funniest epic vision of America ever to reach the screen."