Garageband is an audio recording and production suite for Mac, aimed for the the prosumer market. It is produced only for the Mac. However, there are some web based alternatives you can use for simple audio production, with the added benefit on the Series 3 of the incredibly high quality audio hardware.
If you’re used to using Garageband or another traditional desktop sequencer like Cubase, Sonar or Protools, you’re probably aware that laying down tracks means creating a lot of large audio files, storing, mixing and layering on audio processing on the fly. That’s hard to do in a web application, but there are some surprisingly good options online.
Soundation is a flash based multichannel sequencer, featuring a sampler, soft instruments and a built in loop library. If you want to lay out a simple house track it’s actually pretty capable – the default loops are high quality, and you can layer effects like phaser, distortion and delay on top of the track, all playing in real time.
Audiotool is more like Reason than a traditional desktop sequencer, so if you prefer that style this is a great option. Audiotool contains a host of very high quality samplers, synths and effects that you can combine together to create some great sounding tracks.
Audiosauna is a fairly traditional sequencer, but it’s more for note triggered soft synths rather than audio loops. There’s a number of soft synths available as well as a mixing rack and effects.
UJAM is probably the closest online package to Garageband – it’s made for writing simple synth & loop based tracks with real audio vocals that record from the built-in mic on your Chromebook (via Flash audio). If you are using a Series 3, you can expect UJAM to be a little jittery, but still usable. The only downside is the interface, which isn’t styled after traditional sequencers, so if you’re used to the Garageband layout it may take some getting used to.