"Diamond Ring"??? whose song is that???

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I love to listen and sing "Diamond Ring" along. It's a very great song, I guess. but,when I come to a cafe, and I ask 'bout this song, the singer knows nothing about it, and off course he/she cannot sing this song. I am really upset that my favorite song cannot be sung in that cafe. and, my fellows also don't know 'bout this song, they just know "Always"; "Thank you for loving me". Why do they know nothing 'bout this song. It is Bon Jovi's...