I've been listening to Ethereal Feel by Nito. I've been slowly but surely learning to play it on guitar, but it's difficult! When you get it right though, it's the most satisfying thing ever.
Ethereal Feel is probably my favorite instrumental of all time, and this is me saying that despite listening to metal instrumentals a lot. Multi-string tapping is something rarely seen, especially when incorporated in a full song format. It gives the piece a real unique sound when mixed the not-perfectly-consonant chords and flurry of notes. Likewise, it's on a clean guitar (as opposed to a classical/acoustic guitar) which gives it slightly more crunch in the tone + availability of notes not usually played on non-electric guitars. Even more, Nito has a unique sort of vibrato, quicker than the average solo-guitarist. It all comes together to create a melancholy... or as per the title, an "Ethereal Feel." Agh, I could really dissect the piece further, but in any case, I just really like this song.