'dem andenken eines engels'? ...well, it's not exactly a song! i dunno if you like 'classical' compositions; though it isnt exactly calssical, it was written in ca. 1932 by alban berg and is basically a concerto for violin and orchestra. to me it'S just the best, most emotional, most awesome piece of music i've ever heard. so i encourage you to check it out for sure but there might be a good chance that you won'T like it and most probably ou will not like it after the first listen!

...but go ahead and check it out (you might find it under the title 'to the memory of an angel' which is what the original german title means).
np: it's still playing