Stevie Wonder has some blinding stuff for getting you out of a fug and into some funk.

Good call, crack out Innervisions, Talking Book or Songs in the Key of Life.
Or Superstitious - GREAT track.
Good feel good tracks though, 'Bus Stop' by The Hollies, 'Summer In The City' by The Lovin' Spoonfull, 'Lazy Sunday Afternoon'' by The Small Faces, 'Norwegian Wood' by The Beatles, 'Alcohol' by Barenaked Ladies, 'Puple Haze' by Hendrix.