The big issue with that is that it forces the player to almost not move at all.
That really isn’t an issue any more. Several companies make miniature, high quality external condenser mics that have clips and goosenecks designed for positioning on acoustic guitar bodies. You can aim these little mics exactly as you would in the studio.
I really like mics by the Danish microphone manufacturer DPA, who’ve come out with a very small condenser called the d:vote 4099, that works that way. DPA used to be called B&K; most studio folks will know about B&K mics. Most DPA mics are extremely expensive, these aren’t, and they’re broadcast-quality mics.
Or:
You can get the new product my company is introducing at next year’s NAMM show, called the
Guitarist Anchor Kit, that nails the guitarist and bass player in a band to a single spot on stage. The anchor weighs enough for even the most rotund guitarist or bass player, and the ankle shackles are padded, very comfortable, and decorated with musical motifs. We make a special set for metal players with spikes around the shackles. They’re really impressive! And there’s no more need for wirelesses, because annoying guitar player movements are completely eliminated, so ordinary guitar cables can be used without worry over tripping on stage. Now the only tripping is done with, you know, psychedelic substances.
There’s also a quick-release mechanism (controlled by the keyboard player, of course!) in case an amp blows up and catches fire, or the audience starts to throw dangerous projectiles at the band. This gives sensible keyboard players not only control over annoying guitar players’ tendency to jump around on stage, it also allows them to enjoy seeing the guitar players pelted with non-dangerous vegetables, etc., if they want to be entertained during the show.
We’re also planning a special model for singers, that has the anchor and an attachment for a mic stand with a mirror that can be positioned so singers can admire themselves during a show.
Edit: The accordion/banjo player model comes with a plaid leisure suit. Our next exciting product will be the 12th Fret Block, that simply snaps onto the fretboard without damaging the finish of an expensive instrument, and prevents the player from going above the 12th fret for annoying weedly-weedly. A pet project I’m working on is going to be called the
Djent Prevent, and next in line will be the much-requested
Tone Copper. The Pedalboard Forklift is already in production.