This application was made to help me choose a headphone before buying it in-person. This might also be useful to you if you wanna buy or test headphones.
Resources used
Music
Left and Right sound was extracted from this youtube video. License is unknown
Short sound was downloaded from freesound.org. License is CC BY 4.0 DEED
Long sound was downloaded also from freesound.org. License is CC0 1.0 DEED