I need sad music, fast, for drama?

Ok, ive got a drama performance next week on the 7/7 bombings. I need a piece of music that is at least 20 mins long and has no words in it. It needs to create a sad atmosphere. Any help?
Update: if its not 20 mins, u can give that as well, i might figure out how to edit... XD
Update 2: i dont need sheet music (i dont play piano) I just need music. Give me youtube if u hv to, ill go then find it and buy it. I just need music
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