I have no direct knowledge about that, but if we take the analogy of the egg (shell, albumen and yolk sack) being the life-support system of the embryo during gestation, in humans the placenta would be a big part of that, and exactly whose body it is part of its not simple (from what I remember both mother and child contribute cells, and the ‘plan’ for building it comes from the father’s genes). So maybe for chickens it could be ambiguous whether the shell ‘belongs’ to the laying generation or the hatching one. Seems like mostly a human taxonomy distinction to make anyway, obviously it’s in between the two, but we like to draw the line somewhere.
A lot of old hard rock and metal with power chords is easy to play a simplified version of. I think Metallica - ‘For whom the bell tolls’ and ‘Enter Sandman’ were probably the first things I learnt. You can learn enough to have fun playing a riff like that even if you struggle to get your hand into position to do proper 6-string chords.