Computer Science for IGCSE & O level - Data Representation (Section 8 - No. 1)

In the context of data compression, what does the term 'perceptual music shaping' refer to?

Modifying the rhythm of a song to reduce file size.

Removing sounds outside the human ear's range to reduce file size.

Adding extra sounds to make the music richer.

Changing the key of a song to optimize for compression.

Perceptual music shaping eliminates sounds that are less perceptible to the human ear, thus allowing for compression.