In other words, the cycle of five (1, 2, 3, 4, 5) is played twice in the course of an hour. For a clock chiming mechanism, this has the advantage that the mechanism that trips the hammers need only store five sequences (1, 2, 3, 4, 5) instead of ten. The mechanism then plays two complete sets of five sequences for each complete hour. In musical terms, the first and third quarters finish on the dominant (B), while the second and fourth quarters (the half and full hours) finish on the tonic (E). This produces the satisfying musical effect that has contributed to the popularity of the chimes. Note that the pitch of the Big Ben clip is closer to F than E in modern concert pitch.