Another option is Pzizz Sleep, which uses binaural sounds, spoken words and music in new combinations each time the user opens the app.
Sound artists use noise, live performances by musicians, recorded ambient sounds, spoken words, audio-visual tapes and other aural elements to create art installations that either have no visual elements or forge a connection between images and sounds.
But during climactic moments, when recorded sounds, spoken voices, radio static and eerie noise create aural collages, the effect is chilling.
Their psychedelic sound spoke to a generation of ravers during the second "summer of love".
In addition, in each picture, a single strip of fabric emerges from her mouth, like materialized sound, spoken or sung but unheard, a reminder that sound was a crucial component in her Venice performance.
Yet the sound speaks of extraordinary unanimity in its strength and its constantly changing subtleties of volume, tone, balance and sway.
The heart of the Umphrey's McGee sound, speaking of the Allmans, is a two-guitar rapport between Mr. Cinninger and Mr. Bayliss, often unfurling in a corkscrew harmony.
His sound spoke to me from a very early age.
Organ pipes are made from either wood or metal and produce sound ("speak") when air under pressure ("wind") is directed through them.
