History: What is the recommended listening level for music?

What is the recommended listening level for music?

• Usually, 80 to 90 dB SPL.
  Yes.
• Usually, 60 to 70 dB SPL.
  This isn't a bad level to listen to, but most textbooks would recommend louder for mixing.
• Usually, 0 to 140 dB SPL.
  This is the range of our amplitude perception.
• 100 dB SPL or above.
  There's a risk of hearing damage above 100 dB SPL.