Hard House sounded very different then to what it is now as it had more trance like riffs in it. But at the time a lot of stuff Tony de vit/Jon the Dentist/baby doc played was called hard house when it was played at the likes of trade in london. Hard trance now is more bass and kick orientated then the classic melodic riffs in trance we all love from the ninetees. But its still classed at hard trance. Even hard house from 2000 has changed imensly from now when it was a lot more bouncy and hoover driven. hard house now has reversed and has more trance elements in it now.