A way to add (mix) is opening 2 browsers with YouTube and play with them, great fun !

Vocalise Orchestra verssion - Rachmaninov mixes well (adds in time domain) with Nothing Else Matters - Metallica (both Eminor Key)

Songs of the same key mix well together

It may be great to have a wiki type of site where one can submit 2 song mixes and listeners vote

Pleiades Radio wiil be Broadcasting on YouTube

A Radio Broadcast can be a Symphony where the Notes are the Songs themselves

Pleiades 3 section 12dB per octave passive highpass pi filter based on EMI RS106A