In poetry, internal rhyme, or middle rhyme, is rhyme that occurs within a single line of verse, or between internal phrases across multiple lines. By contrast, rhyme between line endings is known as end rhyme.
Percy Dearmer (1867-1936) revised John Bunyan's (1628-1688) poem "To Be a Pilgrim" in 1906. It became a popular hymn when Canon Charles Winfred Douglas (1867-1944) set it to music in 1917. Here are Dearmer's lyrics, with the internal rhymes in bold. Notice that in these three quatrains the internal rhymes are also echoed in the line rhymes (also in bold).
He who would valiant be ’gainst all disaster,
Let him in constancy follow the Master.
There’s no discouragement shall make him once relent
His first avowed intent to be a pilgrim.
Who so beset him round with dismal stories
Do but themselves confound—his strength the more is.
No foes shall stay his might; though he with giants fight,
He will make good his right to be a pilgrim.
Since, Lord, Thou dost defend us with Thy Spirit,
We know we at the end, shall life inherit.
Then fancies flee away! I’ll fear not what men say,
I’ll labor night and day to be a pilgrim.
Internal rhyme schemes were extremely common in popular song of the Swing Era. One familiar example is the bridge from "Don't Fence Me In," written by Cole Porter for the film "Hollywood Canteen" in 1944:
Just turn me loose let me straddle my old saddle,
Underneath the western skies,
On my cayuse let me wander over yonder,
'Til I see the mountains rise.
Internal rhyme is used extensively in rap/hip hop music, where it sometimes overlaps with assonance. The usage of internal rhyme in rap has increased over time, but can be found even in the earliest rap songs, such as the Sugarhill Gang's 1979 single, Rapper's Delight: