Soundation is a free service that allows anyone to create and remix sound tracks online. If you have used Apple's Garage Band or Aviary's Myna, Soundation will look familiar to you. Soundation provides five tracks on which you can place music clips and sound effects to mix together. To create your original work you can select from Soundation's gallery of 400 free sounds, upload your own sounds, or record new sounds using the instruments and keyboard built into Soundation. When you've created a product you like, you can download it or share it in Soundation's gallery.
UJAM is a service that aims to make everyone a singing sensation. Okay, so it might not make you a singing sensation, but it could help you create music tracks that you can share with friends and use in multimedia productions. Here's how UJAM works; you sing or play an instrument while recording to UJAM. When you're done recording, use UJAM to alter the sound quality of your voice, turn your voice into other sounds, adjust the tempo of your song, and or remix a song to include your recording. UJAM is essentially an online, light weight version, of Garage Band.
Incredibox is a neat website that allows you to create unique rhythms and sounds from drag-and-drop menu. The sounds in the menus are recordings of a Bobby McFerrin-like artist making "human beat box" sounds. You can experiment with different sound loops, choruses, and instrumental sounds to create your own unique sound loops.
Beat Lab is a free service through which you can experiment with thousands of sound and rhythm combinations. Using Beat Lab is easy. Beat Lab provides a grid on which you select the sounds you want to have played. You can specify how often you want each sound played and how quickly you want the sounds played. There are twelve default sounds provided in the Beat Lab grid. You can add more sounds by selecting "add more sounds" and choosing from the huge catalog of sounds. If the sound you want isn't available in the Beat Lab catalog you can upload your own sounds.
SoundCloud is an online service for recording, hosting, and sharing audio tracks. You can use SoundCloud to upload and share audio recordings that you have stored on your computer. SoundCloud can also be used for directly recording a spoken track. One of the really neat features of SoundCloud is the option to comment on tracks as they are playing. To make a comment just play the track, click on it, then type your comment in the comment box. Your comment(s) will be attached to the spot in the track that you clicked on while listening. SoundCloud has apps for Android and iOS devices.