If like me you you are pretty much tone deaf, the invent of electronic guitar tuners and tablature is a godsend that allows one to play music immediately, that sounds reasonably ok.
For those of you unfamiliar with guitar tab the lines represent the guitar strings, the thickest string being represented by the bottom line and the numbers represent the frets the little line over 6 5 means you slide your finger from the 6th to the 5th fret after you have plucked the string and the 0 means you don’t press down on the fret board at all but play the string open, that’s about it really.
So now they are both learning Deep Purple’s Smoke on the Water, the one string version to start with, tablature above, as it’s on one string the guitar doesn’t have to be in tune for it so sound reasonably ok.