There is a mention of John Murphy earlier in the thread. I first heard him last summer in an after hours pub session in Co Wexford, and it was stunning. if you're interested in reels on the harmonica, certainly have a listen to him (and his dad).
    Having said that, the title "fave harmonica bits" took me right back to when I was 12 or 13 and used my hardearned pocket money to buy my first Leadbelly record, a green Melodisc EP. And on this record was "On a Monday", and between two of the verses there is an amazing bit of chugging from Sonny Terry. The combination of Leadbelly flat out on his 12-string and Sonny Terry's harmonica matching him rhythmically has been singing in my heart ever since.