Classifying music is ultimately pointless so I just have fun with it really, to be honest don't really care. 
However, I would argue 'ambient' is a kind of meta genre, you don't just neatly drop music into it at the exclusion of other genres, it will overlap most other genres too (I feel a venn diagram coming on...) So jazz (for instance) could be ambient but most jazz would be too busy to be really ignored in the way Eno suggests (sure, you can turn down any music and background it but not really ambient then in the spirit of this discussion).

However, I would argue 'ambient' is a kind of meta genre, you don't just neatly drop music into it at the exclusion of other genres, it will overlap most other genres too (I feel a venn diagram coming on...) So jazz (for instance) could be ambient but most jazz would be too busy to be really ignored in the way Eno suggests (sure, you can turn down any music and background it but not really ambient then in the spirit of this discussion).
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