When you say it just sings are referring to its tone, acoustic volume or sustain?
Kind of all 3 I suppose, not so much acc volume, but definitely tone and sustain. And plugged in sounds even better. I was particularly taken with the quality of the tone and just how much sustain it had (compared to other guitars I have). The JPLP has a single piece mahogany body with book matched maple top. Does single piece make a difference ? or is it mostly the quality of the wood.
I believe it can make a difference what wood you use and various constructions (eg straight through neck/body etc) but nothing like as important as it is for acoustic instruments.
The first guitar I made from scratch (doing a guitar building course >35 years ago) Classical sized body (for even bass/treb reponse), has a western red cedar top (arched to 25' circle), sapeli (African) mahogany back neck and sides, back arched to 18' circle, Gaboon ebony FB and Indian rosewood bridge & binding. Peg head veneer ebony/maple/rosewood. Neck is "Spanish foot" join and LP scale length and widths (I made this to play acoustic solos in the studio). As Van said, sapeli is very well balanced (and lovely ribbon grains) so good for recording. Cedar develops it's tone very quickly then kind of stays that way, it's a bit softer than spruce. Spruce generally takes years of playing to reach it's potential (a good example is the acoustic guitar on Jethro Tull albums (like Minstrel In the Gallery), melt me.....). For a live stage guitar you'd consider Rosewood back and sides as is crisper and projects well (or sugar maple ala most violins, chelos, etc which also generally sport a carved spruce top). Arching the top and back help volume and reduces standing waves.