The classic blues harp sound came from playing into an overdriven valve (aka tube) amplifier. There are valve amps available for harps. Check specialist harp dealers. You could also try playing through an overdrive pedal into a regular guitar amp.
I was having a quick look at the harp specialist I use here in the UK and they have a variety of specialist harp gear. It's quite pricey, though.
I'm not a blues player but I bought a shaker dynamic mic from them and it goes a long way to giving a blues type tone, very different from the condenser mic I generally use.
I might try it through my vox mini5 amp with the Input set to their AC30 simulator and see what sound I get. Might be interesting.
In the UK, the copyright term is 70 years after the death of the creator of the work. There is separate copyright on recordings, film, video etc. (called 'Mechanical Rights') which is a fixed term of 50 years though there was a lobby trying to get that increased to 70 years led by some prominent artists whose copyright on their early recordings was due to expire.
I understood that US copyright law was also life +70 years and when the term was increased to 70 years any work published before 1923 was declared in the public domain. This date was how a recent campaign to get Happy Birthday declared in the public domain. They found a published version with the date of 1922 on it which was identical to the one that the then copyright holders were relying on with a date after 1923 so Happy Birthday is now in the Public Domain - in the USA at least, though I suspect it's also true for here as well.
The usual disclaimer about not being a lawyer and what I have written above is my understanding of how things stand at the moment.
You might find you get a copyright notice on a You Tube video but most of the time, you don't need to do anything but you may find an advert precedes the video when someone plays it. If you think the copyright notice is wrong, you can challenge it. I've done so several times for claims on traditional songs and only once have I been unsuccessful. In that particular case, it concerned a song that was originally published in the Irish language and I wasn't sure about the particular translation I had used. I suspect that they were out of order as the song had first been published in Irish in 1848 and an English translation in 1850 but there were several translations about. I then found that the same song had been published in English on Broadsides as far back as the 1780s so I took it down and re-recorded it using an older version and reposted. I've not had any challenge since but if I do, I know where I can point to the source which actually dates to about 1820 for the particular version I used. So there are dodgy copyright claims about and if you are putting up old material as I often do, you need to be aware that there are people who are cheeky enough to claim copyright on old material.
For some reason, I've not checked in her most of January (been busy) so I thought it was time to get back in touch. I'm not familiar with these tunes but they are early enough to be out of copyright so the sheet music will likely be available on line. I'll go and have a look as I like sheet music for learning tunes. Listening is also essential to get a proper feel for the tune.
I agree with John Broeker, to play chromatically, ideally the best solution is to use a chromatic. However I mostly need to play in two keys a fifth apart, typically G & D or D & A for folk dance tunes and for that I have some little magnets that enable me to clamp them together so I can quickly swap from one to the other.
More recently I have acquired two Seydel Samplers which are constructed like a chromatic but with the two rows being a fifth apart rather than a semitone apart like a chromatic. I have them in G/D and D/A and they are what I play most of the time. They are twelve hole solo tuned so have a full three octave range with no missing notes. I really like them, they suit the music I play.
I always take some 10 hole diatonics as backup with me, including several in keys that I need only occasionally. I have never fully cracked bending, it's mostly not needed for the music I play which is largely played in first position so even with 10 hole diatonics I look for alternative tunings to the regular Richter tuning. I have a number in Paddy Richter tuning which tunes hole three blow up a tone to give one of the missing notes but largely keeps the chording structure of the Richter tuning. More recently I have acquired Seydel Orchestra S - in fact I have one in each of the keys they make; lo F, lo C, G, lo D, & A. They have a slightly reduced range of two and a half octaves but they cover the range I need.
Just been through and listened to this years' contributions. I've checked "Thank You" on them all as a way of saying that I enjoyed your contributions.
I notice you folks across the pond either sing different tunes to familiar carols (Sarge - It Came Upon a Midnight Clear & Away in a Manger)
Or we sing different words to the same tune.
Sneaking in under the wire with a couple of year end tunes.
A quick and dirty recording so apologies for the flubs and the extraneous background noises in the second half of the video.