Established as a fan favorite , " Smelly Cat " has become closely associated with Phoebe , Kudrow and the series , and is often ranked highly by media publications among '' Friends ' '' most memorable moments and songs , even rivaling the show 's theme song " I 'll Be There for You " . " Smelly Cat " has been covered by several artists , including '' Friends '' guest stars E. G. Daily , Chris Isaak and James Michael Tyler , co-star Courteney Cox , and singer Colbie Caillat . Notably , Kudrow performed " Smelly Cat " with Taylor Swift live during the singer 's 1989 World Tour in 2015 , with footage of the performance garnering widespread media attention and becoming a viral sensation
1989 World Tour
The 1989 World Tour
Smelly Cat