I'll try to side-step the 'Drift' if possible...

I find Eva Cassidy's Music enchanting - whatever she chose to sing, I think her covers of the various styles are somehow unique, if only for the crystal purity of her sweet voice...

Was she a Folk Singer ?   Sometimes, yes - It's been said that her refusal to conform to a single or particular genre was the reason major labels refused to sign her - How to market ?   Who to target ?

Most recently, I picked up her CD "Imagine"... Like Willie-O, I had been 'stunned' by "Songbird" -   Once again: wonderful, wonderful Music that transcends any specific stilted style (he wrote alliteratively)...

M.