capella playAlong is described as 'Take your own church choir home with you or play every solo to a large orchestral accompaniment!' and is an app in the Audio & Music category. There are more than 25 alternatives to capella playAlong for a variety of platforms, including Windows, Mac, Linux, iPhone and Android. The best alternative is MuseScore, which is both free and Open Source. Other great apps like capella playAlong are Rosegarden (Free, Open Source), LilyPond (Free, Open Source), Frescobaldi (Free, Open Source) and Avid Sibelius (Freemium).
GNU LilyPond is a computer program for music engraving. One of LilyPonds major goals is to produce scores that are engraved with traditional layout rules, reflecting the era when scores were engraved by hand.
Flat lets you write sheet music with your friends in real time with a nice music notation editor. Create and edit your music score documents directly with your web browser in realtime with your friends or colleagues.