The pentatonic scale can follow either the tonic chord in a progression or each chord in a progression. For example, take a progression like C F G C. Although a handful of chords are used here, everything is revolving around C. C is the tonal center or tonic. You can play C major pentatonic scale over the whole thing and this is what most guitarists would do. But you can also switch pentatonic scales over each chord. C major pentatonic over the C chord, F major pentatonic over the F chord and G major pentatonic over the G chord. You hear this done in the song “My Girl” by the Temptations where the riff uses C major pentatonic over the I chord C and F major pentatonic over the IV chord F.
In its simplest application, the pentatonic follows the tonic chord in a progression. So if a song revolves around an Em chord, then play Em pentatonic over the whole progression. Only after you get good at using the pentatonic like this do I recommend trying to switch scales over the chord changes.
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Play Until Yer Fingers Bleed!
Mr. Desi Serna