Whole song and/or percussions should be made using sine wave oscillators only. No other synthesis methods allowed except the classic Subtractive.

DISCLAIMER: Since no many synths have sine as an oscillator, a good option is a softsynt or a sampler with sampled sine waves. There are even some freeware samplers out there.

Winner spends an evening with Mariah Carey:

Additional details:

Term "subtractive only" was used to point out no other synthesis methods are allowed, not to say you need to subtract something from a sinewave. Subtractive synthesis stands for a concept. A classic synthesizer design VCO-VCF-VCA, not just for subtracting partials from the original harmonic. It is a synth design, not just the process.

As of original question - what is to be subtracted. I though you might find it interesting that using two sine wave oscillators and applying cross modulation, osc sync or ring modulation you can create whole population of new harmonics. And there is a lot that can be subtracted from it. Cross mod, sync and AM are a standard part of many subtractive synthesizers.

Just grab any digital or analog synth that gives sine waves, make a few different patches out of them and do a song with it. Standard functions such as: cross mod, ring mod and osc sync allowed.

Or take two different synths, or ten, or a sampler, or different samplers, etc...

Use any effects you desire, etc....

I used the JP-8's VCO2 sine waveform for all parts.

It's obviously a cover of Ace Of Base's "The Sign"

I used the JP-8's VCO2 sine waveform for all parts.  Recorded in Sonar 5 PE, with a few effects from Sonar's stock Sonitus plugins.

All sounds were created using two Mankato Filters and one MOTM 440 filter in self oscillation.  Cross modulation, and a ton of envelope generators were used to modulate the sounds for the percussion.  The music is inspired by old games like Megaman etc.  I actually played the melodic parts, which I don't normally do.  Please excuse the slop.  :) 

"drums" micron
all osc were set to sine. no waveshaping - no noise added

"wtf" FM8
again, all osc were set to sine, but with an FM monster like this one it
doesn't matter too much ; )
(dunno if that went against the rules)

"voice"
was processed through the plogue rebuilder, which resynthesized the samples
with - guess what - sine waveforms
again, this might be a violation of the rules, but the result was too [enter adjective here] to leave it out.

thanks for listening,
SBL

All sounds from the Poly Evolver, except bass from the Virus TI.  All sounds are based on sines and ring modulation.  The Evolver, of course, has that lovely distortion and delay feature which makes sines much less sine-y.

The title is an in-joke with my wife.

Every note in this piece is a sine wave from Logics ES2 synth and all combining of sines was done in Logic's piano roll midi editor. The various voices/klangs are made up of sine tones loosely stacked at the octave, 5th, and dim 5th. I tried using some effects but they added nothing so I've left it raw, so to speak, adding only some reverb and delay. All the movements follow the enigmatic scale.The sound reminds me of the tines on a music box being plucked by a battery of repetitive cylinders.