My brother could do this. One of his friends taught him to play the guitar. He only knew a few chords and only knew the names of half of the chords that he did know. I have no clue how he learned to play the harmonica. Basically, his friend taught him to play like a trained monkey. He could do the James Taylor & Neil Young thing very well. I never mastered the guitar/harmonica thing and I would like to know if you folks did and how you managed to finally get things to click. The last time I tried, I almost got things to click but everything fell apart and I gave up again.
Over the years I’ve bought several of those harmonica holders, but I never got the hang of it. All I could ever get was the draw-blow kind of alternating chord thing.
I can’t even answer a simple question while I’m playing a stringed instrument. I’d hate to even try to do that.
I bought a holder way back in the 60s but it was way too flimsy. I couldn’t play a harmonica which kept moving about randomly. I’ve never investigated whether there are better holders or whether the instability is just something you need to get used to.
Here’s a video of a guy who made a harmonica holder out of a clothes hanger.
http://www.youtube.com/watch?v=vYpgQ8-pAv8
I didn’t find harmoncia holders unstable just differently stabled from holding them with my hands.
Ive played harmonica for several years, and always wanted to do more with it. I picked up a holder a few years ago, and messed around with it, but never too seriously. I attacked it with seriousness last summer, and can do a few songs with it now (but I use a zouk instead of guitar 
) HOKEY SMOKE is it harder than it looked! I was totally floored by the amount of practise it took to get it down. I can only do a few songs, but it adds so much to the performance IMHO (I do a number of Robert Burns things, basing my arrangements off of Jim Malcolm’s interpretations)