Watch the Hammer-ons From Nowhere online guitar lesson by Dave Celentano from Classical Concepts for Rock Guitar
This Santana influenced backing track uses the chords: Bm7 - E9, and the scale of choice is B dorian (B, C#, D, E, F#, G#, A). The pinkie is the weakest finger on our hand so developing a strong hammer on from nowhere with this digit will require extra work. Strive to make the hammer on from nowhere note as loud as a normal hammer on or picked note by focusing on striking the string swiftly and with a bit of force. Also try moving up one octave playing on the B and high E string.