:The reason your edits are being reverted is that you are not citing reliable published sources where they can be verified. I've found a number of web pages that label Cream as proto-metal, but many of them are blogs or fan reviews, which are not regarded as reliable sources. This one could be used, but I think we need something better than that. A Google on Cream +proto-metal returns over 5000 hits – there must be a few reliable sources amongst them.