[Harp-L] Irish Harmonica

[Jon Harl <jonharl@xxxxxxxxxxx>]

I'm not very good at music theory so I have a question. Brendan Power  
in his instruction "Play Irish Music on the Blues Harp" said the two  
most common keys of harmonica for Irish music are D and G. He also  
goes on to explain that for most songs the harp is played in first  
position. For the tin whistle the two most common keys are D and "C".  
I can see logically why you would use a D harp which coincides with a  
D whistle. But the G harp in first position doesn't coincide with the  
standard C whistle. It's not logical to me. Can someone explain?

Thanks,
Jon Harl