Azalin wrote:
Anyway, I am very illiterate regarding music theory and harmonica technical language. So first of all, what is a "3-blow" reed.
A note you have to blow to make a sound is a blow-reed. A note you have to suck is called (politely

) a draw reed. Harmonicas have hole numbers stamped on the upper cover (I've never understood why, as you can't see the number when the thing's in your gob). Holes are numbered from left (low) to right (high) - this is the usual way of holding the harp, though there are no rules. So 3-blow means the note you get when you blow into the third hole from the left. 3-draw would be the note you'd get by sucking that hole.
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Second of all, when you say the sixth of the scale, what exact note is it in D and in G? I assume it's not simply the "sixth note" because in both cases it would be a huge problem!
This refers to the sixth note of the diatonic do-re-mi scale ("lah" in other words). In the key of G that would be the note E and in the key of D it would be the note B. Because of the way blues harps are tuned, those notes are missing in the lowest of the three octaves of the harp. Also because of the way blues harps are tuned, the fifth note of the scale is duplicated. In other words, on a G harp for example the note D occurs on both 2-draw and 3-blow. Blues men need this duplication for their chords and bending, but we players of Irish have other priorities. What the Paddy Richter tuning does is to retune one of these duplicated notes (usually the 3-blow) up by a tone to put that missing note back. Think it through. You don't lose the note you've tuned up because it was duplicated anyway on 2-draw, but you've gained that missing "lah." Neat and simple, and not at all confusing when the gob-iron's in the gob!
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I read a lot on the internet (about harmonicas for irish music) and it's really, really confusing. All docs assume you have basic understanding of harmonicas, but there's no real clear websites for harmonica dummies like me. I rwish there were some "irish harmonica for *dummies*" page, where they actually explain clearly what is the difference between chromatic and diatonic harmonicas without too much technical language.
A diatonic harmonica only has the notes of the do-re-mi scale - no accidentals. Many harmonica players are adept at getting accidentals on diatonic harps by bending or overblowing, but these techniques of getting extra notes are tricky in Irish music (not impossible, but I won't go into all the reasoning here). The Paddy Richter tuning (especially for G harps), and the correct selection of the best key harp for the job, means that you can play the vast majority of Irish tunes on diatonic harps. They're modal, innit, just like the harps... Chromatic harps are the ones with buttons on the end. When you push in the button you get a note a semitone up from the one with the button out. Some players of Irish reverse the slide so that the note goes down instead of up. This can help with ornamentation. Chromatic harps have a different reed setup to diatonic harps, so they usually have wind-saving valves over the reed slots to make it easier to play without using excessive force. There are three main issues with chroms. First, the blow-draw arrangement is not the same as in diatonics, so switching between the two can be awkward unless you've worked hard to get yourself two sets of muscle memory. Second, the valves can be a real bugger. They can seize up, pop, buzz, fall off and generally be a pain in the 'arris. The answer is to keep the harp at body temp when you're keeping it on standby for playing. I put mine in a little pouch with one of those gel handwarmers. Ideal. Third, the slide. It can leak air and it can seize up. Leaking? Stop buying cheap harps! Seizing? Hold harp mouthpiece-down in a shallow plate of hot water and work the slide rapidly back and forth. Shake out and allow to drain the same way up - you don't want too much water getting to those pesky valves. Oh what fun. You could stick to diatonics...
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The other question I have for you Steve, which might be hard to answer, is that I play the C/G concertina, so a row in C and a row in G, what harmonica would be best suited for me? My concertina has an accidental row, so I can play "any key", but I guess there is no equivalent with harmonicas? Also, my goal is not to play in sessions, so I don't mind if I end up playing in different keys. Actually, I'd rather have lower key.
Tricky question for a non-concertina player. I bought a D/G melodeon, thinking that the blow-draw pattern would be similar to a harmonica. And so it is. Thing is, I can't play the bloody thing without breathing out on what would be the harmonica blow notes and breathing in on the harmonica draw notes...

I think maybe you shouldn't worry about this. Just buy some harps and have fun. D and G if you think you may use 'em in sessions, any middling key if not. G and A are good middling keys. If you really want to get very dedicated and play one harp in lotsa keys, buy a chromatic in C. I wouldn't do that myself. Most players of Irish who use chroms would buy them in D and G, or in C# and F# if they wanted to reverse the slides. It makes the ornamentation far easier.
There's a fairly new book out by Winslow Yerxa called "Harmonica For Dummies." I haven't seen it but it's well-regarded, apparently. Winslow is a great player of Irish and Scottish, so his book could be a good investment.