Here is a guise to install Rosegarden on Ubuntu 13.04. You can install Rosegarden using the Ubuntu Software Center.
Rosegarden is a well-rounded audio and MIDI sequencer, score editor, and general-purpose music composition and editing environment. 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. Visit the Rosegarden Homepage.
To install Rosegarden click on the link below
When the software center is opened click on the Install button and enter your password to authenticate the installation. When Rosegarden is installed you can close the software center, to start Rosegarden press the SuperKey and type: rosegarden
Common UNIX Printing System(tm) – BSD commands (cups-bsd)
Advanced file manager, web browser and document viewer (konqueror)
BSD lpr/lpd line printing spooling system (lpr)
Okular (okular) (okular)
Utility programs for AWE32/64 and Emu10k1 driver (awesfx)
Version: rosegarden 1:12.12.25-1
Total size: 108,6 MB to download, 202,6 MB when installed
License: Open source
How to open the apt link? Read this article.