question: Which of these bands has had songs featured in several anime series, U2 or Flow?
answer: Flow
context: Title: List of Haruhi Suzumiya albums
  Passage: This is a list of albums attributed to the anime adaptation "The Melancholy of Haruhi Suzumiya" based on the "Haruhi Suzumiya" light novel series.  There have been three soundtrack singles released for the anime containing the opening, ending, and insert songs featured in the anime series.  Three radio drama CDs were released, along with a single which contained the theme songs to the radio dramas.  A drama CD was also produced and the final track on the CD contained an original music track.  There are nine additional character song albums sung by the voice actors for not only the five main characters in the series, but four other minor characters were also given mini albums.
  Title: U2
  Passage: U2 are an Irish rock band from Dublin formed in 1976.  The group consists of Bono (lead vocals and rhythm guitar), the Edge (lead guitar, keyboards, and backing vocals), Adam Clayton (bass guitar), and Larry Mullen Jr. (drums and percussion).  Initially rooted in post-punk, U2's musical style evolved throughout their career, yet has maintained an anthemic sound built on Bono's expressive vocals and the Edge's effects-based guitar textures.  Their lyrics, often embellished with spiritual imagery, focus on personal and sociopolitical themes.  Popular for their live performances, the group have staged several ambitious and elaborate tours over their career.
  Title: Flow (band)
  Passage: Flow is a Japanese rock band, formed in 1998 and signed on to Sony Music Japan's Ki/oon Music label.  Flow is a five-piece band made up of two vocalists, a drummer, a bassist, and a guitarist.  As of February 2017, the band has released 31 singles and 10 studio albums.  Their songs have been featured in the opening sequences of several anime series.
  Title: List of My Bride Is a Mermaid albums
  Passage: This is a list of albums attributed to the anime adaptation of "My Bride Is a Mermaid".  There have been five soundtrack singles released for the anime which contained the opening, ending, and insert songs featured in the anime series.  There are six additional character song albums sung by the voice actors of six of the female characters.
citations: Flow (band) U2