Reading this made me think, we have:

2 x Acoustic Guitars
1 x Electro acoustic guitar
1 x Mandolin
2 x 5 string banjos
1 x Zither Banjeurine
1 x Banjola
3 x Fiddles
3 x Accordions (2 piano and 1 button key)
1 x Piano
At least 6 x whistles
2 x Bodhran
1 x Recorder
1 octarine (or is that a fruit?)
Various shaky and bangy things

Less than the average anyway looking at above posts