If the angels of heaven didn't play harps, they probably would prefer to play slack key guitar, I am convinced.
Slack key guitar, ki ho`alu, is a uniquely Hawaiian folk tradition born in the 1800s. Slack key guitar is often confused with and actually pre-dates the more well known Hawaiian lap steel developed in the late 1880s or 1890s. Slack key means that you loosen the strings of the guitar and tune them into a chord, which adds the possibility of using open strings more frequently than with the guitar standard tuning (E A D G B E - from low to high). Moreover the slack key guitar has a more full and gentle sound than a coventionally tuned guitar when played with your fingers, as the open strings resonate the picked notes. A common way of slack key tuning is the F Wahine tuning (C F C G C E) or the C Wahine tuning (C G D G B E), but also the Taro Patch (G Major) tuning (D G D G B D), which furthermore is the most frequently used by Hawaiian lap steel players.
More info about the Hawaiian slack key tradition is available here
I suggest you to have a listen to soundclips from his 1994 live-album "Led Live!", available here
More info on Led Kaapana available here
Led Kaapana's website with discographical info and videoclips can be reached clicking here