…there’s gotta be enough space in there (between notes) so that the sound will work in an air space. That’s what makes the music work.
Without space there is no music. Try to imagine every note playing at the same time or being played so quickly that there’s no distinction between one note and the next. You wouldn’t have music. You’d have a solid wall of noise. As Zappa said, “There’s gotta be enough space in there.” You have to leave room for the sounds to be distinguished from each other, to be heard for what they are.