The dulcet tones of Tomokazu Sugita are now filling my ears
The Haruhi OST is one of my all time favorites--definitely check out the live orchestral arrangement Suzumiya Haruhi no Gensou if you haven't already (alternatively, the full concert Blu-ray including interludes is also up on YouTube). The solo violinist absolutely rips it on the fourth track.
for after you've listened to it
Put this under a spoiler because I don't want to prejudice anyone's experience of the music!
I'll be honest, the actual songs (as in the ones with singing) are the lowlights of the concert for me, which is why I always listen to a playlist which excludes them all. The trio are great as voice actors and fine as vocalists in a studio setting, but none of them have to training to be able to deliver a raw and powerful performance in a setting like this, so the energy really tanks during those sections (both because of the weak vocal performances and because the orchestra has to hold back). I understand why it was setup this way (fanservice, more or less), but as a purely musical endeavor I wish they had stuck to instrumental arrangements (classically trained soloists would have been another option, but I still think it would have limited the arrangement unfavorably).
the first time I watched it was like that and that just became their voices to me lol. I just listened to his voice tho and I can see what you mean :>