The melody of I Can’t Tell You Why by Eagles runs 167 notes across 35 bars, 2:21 long in D at 92 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? I Can’t Tell You Why chords and lyrics.