Dear John, The usual approach is to symbolize the structure with something like I- IIIm-VI-II-V-I, and say a good key is C or whatever. I assume that if you just said this is in X mode, then you would be able to go forward similarly. I am not saying I could do this (!!), but isn't that right, modistes? This could be added to songs in the database: a structural analysis and a key/mode for a suggested starting place. Yours, Peter