Both groups received a sleep headphone headband that would play the sound – the piano chord C69 – while they were sleeping, every 10 seconds during REM sleep when nightmares were most likely ...

This interval is called a fifth. Try to play this interval on a keyboard or piano. A chord is a group of notes - usually three or more - which are stacked vertically. They are played together and ...

The Tempe resident has been a nationally certified teacher of music for 45 years, is a former president of the Arizona State ...