Learn piano basics at http://www.zebrakeys.com/lessons/preparation/pianolayout/?id=3/.
The patterns of black keys are consisted of groups of two black keys and groups of three black keys:
C#(Db), D#(Eb), F#(Gb), G#(Ab), and A#(Bb)
See more Free Online Piano Lessons –
Lesson 2 – Names of White Keys at http://www.ZebraKeys.com/lessons/preparation/pianolayout/?id=2/.
Access free “Virtual Keyboard” – http://www.zebrakeys.com/resources/musictools/virtualkeyboard