Hi Maugein,
So glad you enjoyed it Yes, Isaac do Acordeon is a legend! The girl singing with him is just ok, but he's great.
You know, I've been pondering it and I think the key about Brazilian accordion playing (and perhaps Brazilian music in general) is:
1) the "extended" chords used
2) the "passing" chords used
3) the way they smoothly transition between playing very rhythmic segments to long flowing chords
4) the way they seem to hear a background beat, whether they are playing rhythmically or not at any given time, even if they are playing alone.
The only equivalent I can think of in Anglo music, in terms of the way Brazilian musicians just cycle through chords/extended chords/passing chords is jazz or gospel (e.g. Gospel organ). No surprises they're also Afro-American musics.
I think sometimes we don't realise how much African rhythms have influenced not only the rhythms themselves, but the WAY the chords of particular songs/styles are played. This is only clear in (to me at least) SOME American music, but Brazilian music it seems omni-present.
Re. me understanding the music haha, in some ways I do, but then just the other day, I picked up the cavaquinho (Brazilian ukulele, that drives the heartbeat of samba) after hearing a YouTube clip and realised, wow I can STILL improve my samba rhythm, after 4 years of playing it...
With the Hal Leonard book, I think it's a matter of learning the rhythms first and then applying them to any particular Brazilian piece (as long as it's in the same style as the rhythm). But as I said above, that's easier said than done... Haha
Would be great to one day do a Brazilian music/accordion tour, all over the country!