My One and Only, a 1983 musical with music and lyrics by George and Ira Gershwin
Gillies has a YouTube account called LizGilliesOfficial, where she uploads covers of popular songs including: "Wild Horses" by The Rolling Stones, "You and I" by Lady Gaga, "For No One" by The Beatles, "Jealous Guy" by John Lennon, "Father and Son" by Cat Stevens and "One and Only" by Adele.