Thoughts while listening to a banjo version of Auld Lang Syne (which by the way surprisingly rocks)
Lots of instruments can convey emotion.
A violin can emote like nobodies business.
A guitar can emote.
Ooooh a saxophone, now that can emote.
But for me no instrument really sells it like the bagpipes. I mean sure they aren't real versatile. You don't hear a lot of bagpipes in rock music, or Hip Hop, or Reggae, or Country (insert laughter at self here) but in their place bagpipes are totally awesome.