Search the Android Market for the application 'Guitar Scales' and let me know if everything works for you. This is my first app release so be gentle
Purpose: when playing guitar, you sometimes find a small riff - a combination of notes sounding nice together. If you want to expand the riff it's handy to know in which scale it lies (Major scale, Minor scale, ... ). Guitar Scales will tell you for any combination of notes in which scale it lies, and graphically represent this information on a fretboard.
Revenue model: at the moment it's ad supported with limited functionality. As soon as paying apps are possible in my country, I'll release a more complete app.
PS: after publishing I've already seen an issue: when clicking too many notes the result list is empty, I'll work on providing a friendly error message there.
Thanks for testing!