For a gloomy day:This is one of the most heartbreaking, sad and beautiful arias ever written. If you want to cry, this is it! It is taken from Purcell's opera Dido and Aeneas which was first performed in 1688. If you ever thought that baroque music was devoid of sentimentality (or chromaticism) this will give you a completely new perspective.
(--> aria starts at 1:07)
When I am laid, am laid in earth, May my wrongs create No trouble, no trouble in thy breast; Remember me, remember me, but ah! forget my fate. Remember me, but ah! forget my fate.