A group with four main sections: strings, woodwind, brass and percussion. Strings include 1st and 2nd violins, violas, cellos and double basses. Woodwind comprises flutes (including piccolo), oboes, cor anglais, clarinets, bassoons, bass clarinets, double bassoons. Brass includes French horns, trumpets, trombones and tubas. Percussion instruments include timpani (kettle drums) and other instruments which are hit or struck, eg snare drum, bass drum and xylophone. Other instruments, such as the harp, are sometimes included.