How are electromagnetic waves not physical? Also if air was such an issue then the dynamics of a song being played live would be of series inconsistent pattern

How are electromagnetic waves not physical? Also if air was such an issue then the dynamics of a song being played live would be of series inconsistent patterns leading to error in rate based on environmental factors. Rate would be whatever air density allows but whether you received that rate is different. Song recorded vs song played vs song heard when recorded vs song heard when played over speakers. The waveform of both should be highly similar in a way that wouldn’t be considered error besides amplitude or echoes from acoustics. So it’s a distributed message sensing problem? In my perspective I just saw the waveform of a techno song == the rate of data being communicated. 120 bpm is 120 bpm. Loss over distance is it’s own factor based on ability to ack.