The song sung by Kanji Watanabe, in the bar, is called Gondola no Uta, "The Gondola Song". Written in 1915, it is a song about women and how they should find love before their time has run out.
The literal translation of Ikiru is "To Live".
The only Akira Kurosawa film between Yoidore tenshi (Drunken Angel) and Akahige (Red Beard) not to feature 'Toshiro Mifune'.