This weekend, Chamber Music Albuquerque presents performances by four Brazilian masters of the guitar. The Brazilian Guitar Quartet perform classical pieces on several different versions of the instrument, including a special eight-string guitar, displaying both virtuosity and passion. The performances occur on Friday, Jan. 27, at 7:30 p.m. and Sunday, Jan. 29, at 3 p.m. The Simms Center is located on the campus of Albuquerque Academy (6400 Wyoming NE). For tickets, call 268-1990 or go to www.cma-abq.org.