hidden track
piece of music that has been placed on a CD, audio cassette, LP record or other recorded medium in such a way as to avoid detection by the casual listener
en-US/ˈhɪdən ˈtɹæk/
en-GB/ˈhɪdən ˈtɹæk/
piece of music that has been placed on a CD, audio cassette, LP record or other recorded medium in such a way as to avoid detection by the casual listener