I'm very happy with the Sony M10. Sound quality is great through the built-in omni mics. Battery life is incredible. You can use proprietary Sony memory cards if you have them, or standard Micro SDHC cards.

Example field recording -

the tibetan monks are very specific about which frequencies they use. they always sing with a sub bass note of C, and harmonize with two notes D# and F# (or their non-western equivalent) two octaves higher (all at the same time, they are the only people who can sing in chords) they do it by vibrati...

It is also worth considering how instruments are tuned. Today we deal primarily with equal temperament tunings. Equal temperament ensures that tones and semitones maintain consistent relationships across an octave. Prior to the adoption of equal temperament, numerous different tunings were in use, a...