There are some interesting clips available online from this years Celtic Connections in Glasgow, Scotland. This is an annual festival of traditional music (mainly Celtic in flavour by but influence from around the world) held at venues throughout Glasgow over a three week period in January.
The BBC has a collection of clips from this years CC which can be found here:
http://www.bbc.co.uk/celticconnections
There is an interview with Joannie Madden and recordings of the Michael McGoldrick band (flute and pipes - no whistling regrettably) but there is much more besides – worth a perusal!