In this case the tabs (those of his that I've used, anyway) are not note-for-note transcriptions, but arrangements for solo guitar. Basically he takes the melod

In this case the tabs (those of his that I've used, anyway) are not note-for-note transcriptions, but arrangements for solo guitar. Basically he takes the melody, chord progression and other distinctive features of the song, and puts it all together in a way that is playable and sounds good on a single guitar without a singer. Although this kind of arranging can be done quite formulaically, when done well it is usually a genuinely creative process involving plenty of choices on the part of the arranger. I dabble (badly) with an acoustic guitar, and quality solo arrangements that aren't too hard to play are a very valuable thing. The best arrangement I've created for myself could be generously described as mediocre, despite being based on the official sheet music.