The most famous four notes in classical music history kick off Beethoven’s Symphony No. 5 … but what comes next? Find out at the Brown Orchestra’s spring concert. Also on the program is Liszt’s Piano Concerto No. 1, featuring soloist Brian Vuong, and Joan Tower’s 2005 work “Made in America,” a critical yet patriotic look at the hard work it takes to uphold the U.S. Constitution’s lofty ideals of freedom and equality. Sayles Hall Auditorium, 81 Waterman Street.