Holy Week steals all of the focus of Chicago's classically trained singers, so if it seemed that last week there was not much going on in the Vocal Arts landscape - you probably don't celebrate Easter. Activity ramps back up again this week starting with a unique opportunity to hear tenor Javier Camarena in recital with Ángel Rodríguez this Wednesday at the Harris Theater for Music and Dance. Mr. Camarena is making his Chicago debut fresh from a run of Don Pasquale at the Metropolitan Opera in which he was obliged to give one of the few encores ever heard in that theater. Then this weekend, Music of the Baroque presents Monteverdi scholar Jane Glover conducting a most-stylish and luxuriously cast Vespers of 1610. This masterpiece simply is one of the monuments of Western music -as musically dramatic as any opera of its time. For those who have never heard this work performed live, it would be hard to beat MOB's promising presentation.