I tried busking before. I've never had a problem with volume. It's pretty hard to play an accordion softly. Even in a busy inner city train station tunnel.
But what chance does a lone guitar player have against the drone of trains overhead, the echoing click clack of heels and stomping of steel-cap work boots drowning out the chords of Everlong? Bugger all really.
Sure they could use a battery powered amplifier, but a guitar is cumbersome enough to carry around - so all hail the SHamp - a compact amplifier that fits into the sound hole of an acoustic guitar. A cable connects the invention to the guitar’s pickup jack. Too easy.
It wins my inaugural invention of the week...or fortnight...depending how lazy i am.
ps. the image of the gentleman playing the accordion is not me... I could never pull off a flat cap with such style.