Hmmn, I would agree with that........however, the harder thing is getting two tunes which 'step' up the range at the same time (say one goes up every two bars, and the other may be similar however it steps up every four bars etc!). You could spend days searching and still not match anything!.......
As for other records which prove a bit of a nightmare, I reckon theres loads of old tracks!!!! - Or is it just me who cant mix anymore!?????heheheh.
Sirius.