Power Spectrum Sonifier

ℓ → octave,   ν → note,   D_ℓ → volume. CMB & kSZ are frequency-independent.

anti-correlatedindependentcorrelated

press ▶ and sweep ℓ

Two voices, one per probe. Where the probes are correlated they lock to a consonant unison in the centre; as they decorrelate they detune and spread apart; anti-correlated scales turn dissonant and hard-panned. Sweep ℓ to hear the correlation change with scale, and switch bands to hear tSZ flip sign at 217 GHz.