About 

World’s most famous mondegreen. And probably the first reggae millionseller, by Desmond Dekker. 

Original Key

Don’t know - I need to hear it on a Maxell Cassette :-)

Tuning 

Low G

Tab Notes

[ A ] is the intro, played quite freely, with some weird transition chords / timing at the end. Part [ B ] is the verse / chorus, repeat it as often as you like. Just the basic theme tabbed, you have to add the rhythm accentuation on beats 2 and 4 for yourself.  Sliding up the eight fret is the toughest thing here. Took me ages to figure out that last bar and ended up with simple Ab major scale - but I am still not sure.

"Is there a light ?"