I can definitely give a big up to Ella Fitzgerald as well - listening to that Lady is like listening to heaven. Also try A Kind of Blue by Miles Davis or Blue Train by John Coltrane both are rightly acknowledged as being amongst the greatest jazz albums of all time. Personally, I don't like the title 'smooth jazz' as it is used as a catch all term for all sorts of garbage (ie. the aforementioned elevator music and worse - ie. Kenny G and his ilk!!).