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For kicks, I took a look at GLORY...
The loudest sample on the CD is at approximately 2 minutes 59.832 seconds into track 1 ("A Call To Arms"). The sample value is +27,626 out of a maximum of +32,767; in decibels, +27,626 equates to -1.4 dB from the maximum of 0 dB.
So there is 1.4 dB of headroom to work with, which means that the "volume" of the CD can be raised by 1.4 dB without fear of clipping the signal. Any further increases of the CD "volume" would require amplitude compression.
Here are a few screen captures of the waveform, with the decibel scale on the lefthand side of the images:
Track 1 with the orange marker near the end of the track indicating the loudest sample on the CD:
Zoomed view of the loudest sample:
Zoomed view of the loudest sample after increasing the "volume" by 1.4 dB:
Zoomed view of the loudest sample after increasing the "volume" by 6 dB (the clipping of the waveform is signified by the flat peaks):
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"He who hears music, feels his solitude peopled at once." - Robert Browning
"As long as the human spirit thrives on this planet, music in some living form will accompany and sustain it and give it expressive meaning." - Aaron Copland
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