The unplugged trend of the 1990s could be quite revealing. If a band used amplification to mask its deficiencies, going acoustic could easily expose them. But when artists who had a lot going for them -- everyone from Aerosmith and Bruce Springsteen to L.L. Cool J -- went unplugged, they had a lot of strong material to rely on and triumphed in an acoustic or electro-acoustic environment. Stripped of the arena rock amplification it was known for, Maná generally sounds decent on this live-in-a-studio recording for MTV Unplugged. Much of the material is commercial, middle-of-the-road pop/rock fare; ballads like "Vivir Sin Aire" and "Cachito" are enjoyable, though not earth shattering. Nonetheless, the Mexican rock en Español band can be challenging at times.