Two songs that you can use as interval reference songs for the major 7th interval are “Don’t Know Why” by Norah Jones (“I WAIT-ed ‘till I saw the sun”, with the major 7th falling between “I” and the first syllable of “waited”), and “Pure Imagination” from Willy Wonka and the Chocolate Factory (“Come with me and you’ll be in A WORLD of pure imagination”, with the major 7th falling between the words “a” and “world”).