Top 5 cds in a collection

The other day I posted in another thread a question involving 5 essential cds that you couldnt live without, that you would reccomend to someone who wants to broaden their horizions. Guru already gave his input and looking into his selections. I asked a fellow music buff in the office and he said it would take time to determine which. Upon my own reflection I too am having difficulty naming them that from start to finish deliver a great musical experience. Name them and why they are great in your opinion.