it also contains elements of several different types of music, including house, ambient, drum and bass, rock, new wave, eastern and classical music. Vocally, the album was also a marked change from Madonna's previous work; as the singer underwent vocal training lessons for her 1996 film Evita, her vocals exhibited greater breadth and range, as well as a fuller timbre. In many songs, she also abandoned the vibrato which was present in her previous work. Critically, it is said to have Madonna's most full-bodied vocals. The opening track and third single, "Drowned World/Substitute For Love", is a downtempo ballad drawing influences from jungle, drum and bass and trip hop music. The title is inspired by J. G. Ballard's post-apocalyptic science fiction novel The Drowned World (1962). "Swim", the second song, has a spiritual tone. She sings: "Swim to the ocean floor/So that we can begin again/Wash away all our sins/Crash to the other shore". "Ray of Light", the third track and second single, is an uptempo electronic dance-pop song with strong techno and trance influences. A "sonically progressive" track, it also incorporates elements of rock, with a prominent electric guitar riff. Its sound effects include whistles and bleeps. "Candy Perfume Girl" has a grunge intro and continues to pair post-modern beeps and beats with old-fashioned electric guitar flare ups. In the next song, "Skin", Madonna sings "Do I know you from somewhere?" in a yearning voice over the beats of an electronic orchestra. The sixth track, "Nothing Really Matters", is an up-tempo dance track which contains influences of techno. "Sky Fits Heaven" focuses on Madonna's spiritual studies and her daughter Lourdes. Some lyrics include: "Sky fits heaven so fly it, that's what the prophet said to me/Child fits mother so hold your baby tight, that's what my future can see". Elements of the lyric are taken from the poem What Fits? by poet Max Blagg, the poem used for a 1993 advertisement for Gap Inc. "Shanti/Ashtangi" is a Hindu prayer and up-tempo techno song sung by Madonna in Sanskrit, over a driving dance rhythm. The techno dance track features Madonna singing the adapted version of Shankaracharya entirely in Sanskrit with lines such as "Vunde gurunam caranaravinde/Sandarsita svatma sukhavabodhe". "Frozen", the ninth track and album's first single, is a mid-tempo electronic ballad which has a layered sound enhanced by synthesizers and strings. The song additionally contains ambient qualities, a moderate dance