I've only just registered and thought I'd introduce myself. Not sure if this is the right sub-board; if it isn't, please let me know.
I'm a Swiss born harper and whistle player who is now based in Glasgow and I probably don't have to point out that this is an amazing community.
Most of my (non trad-freak) friends are quite obviously fed up with me constantly pestering them with traditional music, but it appears that here I won't have to contain myself! Yay! 
I've been playing the traditional Irish harp for nearly a decade now, and lately I've also been exploring the world of the wire-strung harp. However, about two years ago I picked up the whistle as a second instrument and I've been enjoying playing it and getting better at it ever since. I play Jerry Freeman tweaked Generation whistles, as well as a Burke Session in D and a Burke Viper Low whistle in D. I love the Generation ones for their chiffy sound, whereas the Burke Session is great when playing together with another harper.
Well, I suppose I should give yous a sample of my playing. Please let me know what you think, but keep in mind I only learned the tune today. Recorded on my Burke Session whistle:
https://soundcloud.com/clairseoir/the-m ... ount-cisco
I reckon it is better than harpy, though 
) is the result of a lot of work and practising, but equally as much of listening to a large number of great whistle players, live and on recordings. I think the importance of listening to traditional music cannot be overstressed; it's the only way of getting a feel for the flow and the right rhythm of the music. Going to sessions and understanding the origin of this genre is helpful as well. IMO, it's absolutely crucial that you know in your head what you want a tune to sound like before you work on it. Once you have a clear idea, hear the tune in your head and can hum along to it, start practising, carefully making sure that your playing gets as close as to what you have in your head as possible.