Duke Jordan’s “Jordu” (or Jor-du) is an excellent tune for memorizing the sound of the ascending perfect fourth interval. The first three phrases of the A section all start with the same perfect fourth, so if you listen to the entire head (AABA) you will hear it nine times.

Here is the first phrase:

Listening

• Clifford Brown and Max Roach, Clifford Brown & Max Roach, 1954
• Duke Jordan, Flight To Denmark, 1974
• Mulgrew Miller, Solo, 2010