The same as http://www.freesound.org/people/toiletrolltube/sounds/181700/ without the lower notes and slightly less reverb time. If you're interested in the original midi, ...
This is a nice dangerous sound of a clock.
A simple tone for menu sounds. Made using guitar and electronic filtering.
Martin D45 acoustic single note
Low D, on a nylon strung guitar. belongs to samplepack "Notes on nylon guitar".
This is Metallophone sample. Model: Melody Pan Flute Note: Low E Mic: Behringer C1