Who is the female singer on I-pod commercial who sings an upbeat song with oh and 1.2.3.4?

Sara Bareilles is an American singer, songwriter, actress, and author. She is best known for her hit singles "Love Song" and "Brave". She has released six studio albums, three live albums, and two compilation albums. She has also written two books, "Sounds Like Me: My Life (So Far) in Song" and "Brave Enough".

In 2021, Bareilles released a new single called "I Choose You", which was featured in an iPod commercial. The song is an upbeat, pop track with lyrics about choosing love and happiness. The song was a commercial success, reaching number one on the Billboard Adult Pop Songs chart.