The melody of Southern Cross by Crosby, Stills & Nash runs 423 notes across 73 bars, 5:40 long in A at 120 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? Southern Cross chords and lyrics.