Guitar tunings
Alternate tunings change the open strings to make new chord voicings, heavier riffs or ringing drones easy. Each page lists the notes and exact frequencies, how to get there from standard tuning string by string, the styles that use it and what one-finger chords it gives you.
Use a chromatic tuner for any of them — the free online tuner on this site works in every tuning.
Standard tuningE A D G B EAlmost everything: pop, rock, folk, jazz, classicalDrop D tuningD A D G B ERock, grunge, metal and fingerstyle with a deep bassHalf step down tuningD♯ G♯ C♯ F♯ A♯ D♯Blues rock, hard rock and 80s metal; easier bends for singers’ keysDADGAD tuningD A D G A DCeltic, folk and modal acoustic playing with ringing dronesOpen G tuningD G D G B DSlide guitar, Delta blues and classic rock riffsOpen D tuningD A D F♯ A DSlide, folk and singer-songwriter fingerpickingOpen E tuningE B E G♯ B EElectric slide and blues — the same shapes as open D, a tone higherDrop C tuningC G C F A DHeavy rock, metalcore and modern metalOpen C tuningC G C G C EBig, resonant acoustic sounds, slide and modern folk