A ballad is a long narrative poem. It tells a story having romance, suspense etc. It is musical also. It can be sung with a musical instrument. It often deals with heroic deeds. ‘Lord Ullin’s Daughter’ has all these qualities. It has romance, suspense, heroic deeds etc. The lyrical quality is due to its ab ab rhyme scheme. Then there is repetition of sounds. It is ‘b’ in bonny bride, ‘r’ in ‘dark and stormy weather’, etc. This makes it musical. This poem is, thus, a tale of love and adventure, as all ballads are, so it is a ballad.