Manitas is quite correct.
The bombarde is an instrument which uses a small volume of air at very high pressure compared with most other instruments. A large part of its difficulty is the actual production of the notes long enough to actually play anything and the amount of concentration needed to keep a sustained note. It takes a lot of muscular control of breathing, throat and lips to play at all, never mind play well.
Fingering is essentially similar to a tin whistle, but despite the fact that I have played whistle for about 30 years, I still find it difficult to play tunes on bombarde which I would do with hardly a thought if I was blowing a whistle. I daresay practice would improve this, but the volume of the instrument makes it difficult to find a time to play when I would not disturb other people.
This thread asks a serious question about a serious instrument (and this is a SERIOUS instrument - not to be taken lightly) and deserves to be given proper consideration.
As for music to play, there is an amount of French music on the Web, so a search will find at least some of it. The main problem with a web search is that a vast number of tunes are named "An Dro" or "Hanter Dro", which describes the type of dance which fits them rather than a tune having an identifiabe name - imagine if O'Neill's music of Ireland just listed every polka as "Polka" rather than "Dennis Murphy's Polka" etc.

Right then folks - any sensible or serious comments to make?
Just remember Lynne - people may make fun of the bombarde, but they will think again when their ears start to bleed ;@)
Quack!
Geoff the Duck (heading off to practice "Silent Night" for next Christmas...)