Minor second interval

Minor second in musical notationThe minor second interval consists of two notes with one half step distance. For example, C to Db note will result in this musical interval.

The minor second interval is abbreviated m2 whereas the major second is abbreviated M2. An alternate spelling of minor second is augmented unison.
Keyboard minor second interval 
A minor second with C to Db on the keyboard.

Listen to minor second interval (C-C#):

The sound of this harmonic interval is dissonant, which is a result of two closest notes played together.

In major scales, the minor second interval is represented twice. For example, in C Major (C, D, E, F, G, A, B) the minor seconds are E-F and B-C.

Ascending minor second intervals

A list with ascending minor second intervals:

Descending minor second intervals

A list with descending minor second intervals:

Enharmonic notes such as Cb and Fb are leaved out.