Does anyone know which you should use for your harmonica when playing for example ghost riders in the sky in E minor??

are u asking the KEY or like mics and stuff to play it with

Oh i'm sorry! i meant key but i found the key for playing. but i was wondering if you play a song that's in for example A minor, do you use a ordinary D harp??

well I was told by 2 people that if a key was a Minor or a flat or a low or a high like A you would just do cross harp. but the outher guy said I need to cross harp to the next key but it would be a D Minor, Flat, High or Low.