The melody of Say It Ain’t So by Weezer runs 258 notes across 47 bars, 3:26 long in Ab at 85 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? Say It Ain’t So chords and lyrics.