A minor fourth is a musical interval that spans four diatonic scale degrees but has a smaller distance than a perfect fourth. In terms of half steps, a minor fourth consists of five half steps. For example, if you start on the note C and move up to F♯, you create a minor fourth interval. This interval is often described as having a dissonant or tense quality. In music theory, the minor fourth is commonly used in various genres, including classical, jazz, and rock. It can create a sense of tension that resolves when followed by a more consonant interval, such as a major third. Understanding the minor fourth helps musicians and composers create emotional depth in their compositions.