How A CD Works
A CD, or compact disc, works by reading the surface of the CD with a laser beam, shined against it, to read the data that is contained on the surface.
Whilst it may look very smooth and flat to you, it actually contains tiny grooves that correspond to the music.
A CD also plays from the centre of the disk and then moves outwards, so if you have some skipping then you can work out roughly where it is occurring by noting the track that skips and how far through the play time of the CD it is.
Questions about music: