Frescobaldi 0.7.13 .deb packages for Kubuntu Jaunty 9.04 are available on my PPA.
Frescobaldi is a LilyPond sheet music text editor for KDE4
To install it:

• Copy the lines below and add them to your system’s software sources. (Read about installing)
  
deb http://ppa.launchpad.net/daniele.domenichelli/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/daniele.domenichelli/ppa/ubuntu jaunty main

• Import public key for my PPA:
  
  sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 9D0C02D0

• Update and install package frescobaldi
  
sudo apt-get update
sudo apt-get install frescobaldi


EDIT:
I found out that there is a launchpad group for Frescobaldi at https://launchpad.net/~frescobaldi that built Frescobaldi 0.7.13 on their PPA.
Anyway I believe that the package for jaunty on its PPA was built with Kde 4.2, and I’m not sure if it would work on Kubuntu jaunty with with Kde 4.3