The melody of I Celebrate The Day by Relient K runs 359 notes across 82 bars, 3:03 long in D at 120 beats per minute. The tab sits almost entirely in the first two frets, 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? I Celebrate The Day chords and lyrics.