Sam Cooke - Live at the Harlem Square Club, 1963. I don't know a lot about soul music, but this is an album that always makes me very cheerful. If you're looking for something new, definitely give this a try. This is also one of the best live albums ever recorded.
A lot of songs from the Neutral Milk Hotel - In the Aeroplane Over the Sea album also make me very cheerful. As a music lover you probably already have this though, if you haven't you're missing out and you need this right now.
Also check out some bossa nova music. It's a very cheerful jazz style from Brazil that will make you feel warm inside. A few recommendations: João Gilberto - Chega de saudade [1959], Stan Getz & João Gilberto Getz / Gilberto [1964], Antônio Carlos Jobim Wave [1967].