Im quite specific myself about this subject, Personally I kinda feel its cheating but this is just my own personal view, I much prefer to mix tunes up more and play stuff which really shouldnt work when you think about it but then put it into practise and it really works, however in saying this sometimes you can come up with some incredible mixes, I remember year ago when Pendulum hadn't been around long I used to love doubling up their tunes, Best ones were Vault & Back 2 U, Vault & Another Planet and best of all Vault with Tonight (Pendulum Remix) In these instances as much as looking at it now this is anthem bashing to the max but the similarities in Pendulum's arrangement means that tunes compliment each other so well not to mention the fact Pendulum's mix downs are so perfect even with 2 tunes it still sounds crisp, Another one Im guilty of is teasing X Ray intro over Join The Dots intro.