most harp in this style of music is in second position, easy way to figure a key for harp is if you know what lkey the song is in count 4 up in harp including that key. Song key A would be harp D (cross harp) Song in B would be E ect..., sharps and flats not quite that clear and simple. In my harp case I have every key including all 12 harps..if you have cd to match and find the key use it as oppposed to an MP3 I dont trust mp3 commpresion to hold notes true.