There's one chord progression that studies show works best to make listeners feel good—and it's the one Paul McCartney used for "Let It Be." ...

Or you could go further a field (but still in the key) by using a Dsus4 chord (xx0233) or a D7sus4 (xx0213). All of these chords are possible choices depending on the way you want it to sound.

A look at the reasons why a guitar goes out of tune despite no one playing it, and how one can prevent that from happening.