The melody of If I Only Had A Brain from The Wizard Of Oz by Harold Arlen runs 160 notes across 26 bars, 1:05 long in D at 180 beats per minute. The tab sits low on the neck, mostly under the fourth fret, one note at a time — no chords to barre and no strumming pattern to keep up with. A piano backing track plays the chords and bass underneath, so the line you are learning sounds like the record even at half speed.
Prefer to strum and sing it instead? If I Only Had A Brain from The Wizard Of Oz chords and lyrics.