above,see 4 minutes 57, when you are playing parts it has to be right, tempos have to be right, that where metronomes are useful, you listen to a metronome spped and you bloodt well get it right, there is no messing about
now the same thing applies in sessions ,occasionally players start off to fast for them selves , when you are at home it is easily rectified get a metronome speed before you start playing, every time you play the tune at home you get a metronome speed before you start, at a speed that the player can manage all the tune, then gradually notch it up, with an electronic click this can be done very gradually, eventually you get so used to starting at a certain speed , that starting too fast becomes eradicated, thanks to using a metronome properly.