"Who Says" 是由 John Mayer 演唱的一首歌曲，其歌詞如下：
Who says you can't go back,
Who says you can't try again,
Who says you can't get your heart broken,
Who says you can't fall in love again?
這首歌的歌詞表達了一種積極向上的態度，鼓勵人們不要被過去的失敗或傷痛所束縛，要相信自己有再次嘗試、再次愛、再次被愛的能力。
以上歌詞僅供參考，如需要準確信息，建議查閱相關歌詞文檔。