I use Everly Phospher on Most of My Guitars -They sound great on my 1943 D18, my 66 0-21 and '72 D 41 I think John Pearce sound better on my Gibsons - a 43 J100 and a 44 Southern Jumbo as well as on my 77 OM-45 Martin and my '34 00-42 for some reason the ONLY strings that sound good on my 1950 000-18 are DRS - The Everly String Company is owned by Phil and run by his son Jason -Like D'addario but a hair better.