《Day by Day》是Big Bang演唱的歌曲，收錄於2012年發行的專輯《Alive》。
以下是《Day by Day》的歌詞：
Day by day, Oh oh oh
Yo, we up and at em', ya know what I'm sayin'?
(Yeah, this is what we like)
Yeah, we the best, they can't deny
So here we go, Day by Day
Verse 1:
走在熙攘的街頭，你微笑的眼眸
緊握的手心在顫抖，心跳加速的節奏
我們的愛情，像煙火般絢爛綻放
每一天都更加堅定，我們的愛永不褪色
Chorus:
Day by day, Oh oh oh
Every day, I'm feeling you in my dreams
Day by day, Oh oh oh
Every day, I'm falling deeper in love with you
Verse 2:
時間在流轉，我們的愛情在升溫
每一天都更加堅定，我們的愛永不褪色
無論風雨還是晴天，我都陪在你身邊
每一天都更加堅定，我們的愛永不褪色
Chorus:
Day by day, Oh oh oh
Every day, I'm feeling you in my dreams
Day by day, Oh oh oh
Every day, I'm falling deeper in love with you
Bridge:
愛你的心，從未改變
每一天都更加堅定，我們的愛永不褪色
無論何時何地，我都陪在你身邊
每一天都更加堅定，我們的愛永不褪色
Outro:
Day by day, Oh oh oh (Oh oh oh)
Every day, I'm feeling you in my dreams (in my dreams)
Day by day, Oh oh oh (Oh oh oh)
Yeah yeah yeah, Everyday our love is forever deep (forever deep)