
Carlos M. answered 06/13/20
Music Theory/Composing, Production, Saxophone - Adjunct Professor
A melodic interval is the distance between two pitches. Understanding the different types of intervals can help us understand how melodies are crafted. For instance, the jump of a perfect fourth often remind us of the famous wedding song, and a jump of a major sixth often reminds us of a ringing doorbell. Larger intervals in succession can also create more tension or energy in a melodic phrase while seconds and thirds are more songful. These intervals often give us emotional feeling as we listen to music, thirds and sixth are often very melancholy for instance, while minor seconds or major sevenths might make us feel unsettling.
A harmonic interval is just the same concept but with two or more notes ringing at the same time, such as in a chord. This has the same principles except that when a note is played, there are overtones ringing above and below that note. As more notes are added, more overtones are added and start to clash, creating more tension in the sound.