An octave mark is included before the first note to specify its octave and when it changes unexpectedly. For instance, the 4th Octave is the octave starting with middle C and going up to the B above middle C. A melody clearly proceeding upward from the first octave can, if moving by step, proceed to the second, third, and fourth octaves without requiring additional octave signs. The rule is that, save for an octave mark specifying otherwise, notes move by a unison/no change, 2nd, or 3rd rather than a 6th, 7th, or octave. For instance, the following moves upward continuously, ending in octave 5: