def delsong():
    """
    @api {post} /music/collect/delsong 取消收藏单曲
    @apiVersion 1.0.0
    @apiGroup Collect
    @apiDescription 取消收藏单曲

    @apiParam (Headers) {string} token 令牌
    @apiParam (Headers) {String} device_token 设备令牌
    @apiParam (Headers) {String} content_type 内容类型
    @apiParam (Headers) {String} timestamp 时间戳

    @apiParam (Body) {String} itemid 单曲编号

    @apiSuccessExample {json} Success-Response:
    "Success."

    @apiError (Error) 31011 No item id in the request params!

    @apiErrorExample {json} Error-Response:
    {
        "data": "No item id in the request params!"
    }
    """
