If the song isn't available on legal platforms, perhaps suggest checking official music stores or the movie's music label website. Maybe mention services like iTunes or Spotify if they are available in their region. Also, note that some platforms offer high-quality downloads, so that might meet the "Extra Quality" request.
When downloading MP3 songs in extra quality, ensure that you're using a reliable source. Here are some tips to keep in mind: Bapi Bari Jaa Bengali Movie Mp3 Song Download Extra Quality