title: How to tag m4a music with nodejs
body: <p>I have to tag a m4a song using nodejs. </p>
  
  <p>I looked an already tagged file, and I though that it would be as easy as opening the file and writting the tags in the ilst section... but no.</p>
  
  <p>Can anyone explain it for stupid people like? is there any library or package for doing it?</p>
  
  <p>Thanks in advance</p>