Hi, im new this site and to harmonica in general. I can play from tab and understand the system. Its just certain tabs have the writing above every word. Is this following the tune? Or is it substituting singing by playing the syllables of the lyrics?
Many thanks
Brad

Lyrics are written above the notes so you can relate the words to the melody you are playing on your harp.

It depends on the tabber. Some folks put the notes (appropriate hole number{s} and whether to blow or draw) above the lyrics, while others put them below. Some tabbers don't put in the lyrics at all. If the tab is a duet, has accompaniments (like backup singer's parts), or other form of "ensemble" tab like a trio, quartet, or quintet, then the notes/numbers are both above and below the lyrics (if there are any lyrics). But usually on those tabs there's an explanation at the beginning of who's part is what and where (and sometimes what color).

Most of the time, the notes/numbers are representing the main melody line (what one sings) and it just depends on the tab author's preference whether it's above or below the lyrics (if lyrics are included).

Welcome to the site, Brad! How long have you been playing?