Rehearsal: Cristian Măcelaru conducts Anna Clyne, Elgar, Debussy, and Enescu featuring Yo-Yo Ma, cello

Taking its cue from the “Proms” idea of the commission, her five-minute, single-movement Masquerade combines the imagery of a festival, multilayered outdoor activity with familiar musical ideas smeared and reconfigured into new ways of sounding.

Unlike the traditional three-movement concerto, it has four movements, not for length and weight but for diversity and contrast.

Part symphony and part tone poem, Debussy’s innovative La Mer is one of the most influential pieces of the 20th century and has been as an audience favorite for more than a hundred years. La Mer was premiered in 1905 and the BSO gave the American premiere in March 1907.

George Enescu composed his enormously popular Romanian Rhapsody No. 1 when he was just 19 years old, drawing on his prodigious musical memory to create a sparkling orchestral medley of traditional Romanian folksongs he had heard and played as a child.