Here is a guide that shows you how to install rosegarden on Ubuntu 11.04. Rosegarden is a well-rounded audio and MIDI sequencer, score editor, and general-purpose music composition and editing environment.
To install the latest version of Rosegarden open a terminal window (press Alt+F2 and type: gnome-terminal) and copy+paste the following line:
sudo add-apt-repository ppa:ferramroberto/rosegarden
sudo apt-get update
sudo apt-get install rosegarden
To start Rosegarden press Alt+F2 and type: rosegarden.
Rosegarden Homepage
Rosegarden is an easy-to-learn, attractive application that runs on Linux, ideal for composers, musicians, music students, and small studio or home recording environments.
Rosegarden is a MIDI and audio sequencer and musical notation editor whose purpose is to serve as the sequencer of choice for users who prefer to work with music notation. Rosegarden allows you to record, arrange, and compose music, in the shape of traditional score or MIDI data, or of audio files either imported or recorded from a microphone, guitar or whatever audio source you care to specify. You can use Rosegarden to write, edit, and organise music to create a composition, which you can then synthesise, add effects to, and mix down for burning to CD or distribution on the web.