错误提示：

! [rejected] master -> master (non-fast-forward)
error: failed to push some refs to 'git@gitee.com:xx55999/musickoa.git'
hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. Integrate the remote changes (e.g.
hint: 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

错误原因：

本地没有update到最新版本的项目（git上有README.md文件没下载下来）

解决方法：

git pull --rebase origin master

把github上最新的文件下载下来,再push

案例

参考：
已解决】github中git push origin master出错：error: failed to push some refs to