John Lennon played it on repeat. Frank Sinatra called it the best song of the 1970s. How a simple C9 chord inspired a timeless top-10 hit

It was a spiritual download that just flowed through me”: guitarist Graeham Goble explains how learning this extended chord ...

What are ‘binaural beats’ — and can they hack your brain for better sleep?

Early research suggested that it can help people fall asleep and relieve anxiety. One study using binaural beats at a frequency of 3 Hz induced delta brainwaves, which lengthened stage three sleep, or ...