Time signatures indicate the number of beats in a measure and which note value receives one beat. Common time signatures include 2/4 for march time, 3/4 for waltz time, and 4/4 for walking time. Clefs such as the G clef and F clef are placed at the beginning of the staff to indicate the pitch of the notes. The staff is divided into measures by bar lines, with a double bar line indicating the end of a song.