And the angels sing. “Messiah” is a staple this time of year. While not written specifically for Christmas, it has become one of the most-frequently performed works in all of music. Composed in 1741 by George Frideric Handel, with text compiled by Charles Jennens from biblical sources, the opera-like oratorio chronicles the life of Jesus, from annunciation to resurrection. The ever-popular “Halleluiah” chorus is in part two. Bourbon Baroque, with its period instruments and appreciation of 17th- and 18th-century music, performs “Messiah” on Saturday, Nov. 25 at 8 p.m. and Sunday, Nov. 26 at 3 p.m.