Who sang the Academy Award winning song from Up?

The Academy Award-winning song from the animated film "Up," titled "Married Life," was composed by Michael Giacchino. However, the song that is often associated with the film's emotional themes is "Up with Titles," also composed by Giacchino, and the film's poignant score is largely instrumental. If you're referring to songs with lyrics, "Married Life" is primarily instrumental, showcasing the film's emotional depth through music rather than vocal performance.