The legend says that in cold winter days, the ghost of Lola Montez can be heard moaning at her namesake lake in the Sierra.  We went to check yesterday, and we clearly heard repeated moans coming from the frozen lake.  We recorded a few of them.  A spectral analysis reveals that Lola had an unsually low voice, with a distinct frequency peak at around 154 Hz.

(Note: you should listen to the recordings using headphones; laptop speakers generally cut off low frequencies.)

You can download the audio here.

Here’s interesting information on frozen-lake sounds.