If you want to know how a certain chord is played on a keyboard, this interactive tool will be of help to you. Choose the root note on the left and then the chord format on the right. The note names needed to play the chords will automatically appear on the "Formula" box. The keys will also light up on the piano to guide you accordingly. If you want to invert the chords, simply click "Invert Chord". You can also search for a particular note or chord by entering the note name or number on the "Formula" box and then clicking "Display". My thanks to our javascript expert Stephen Chapman for helping me create this interactive chord library.