Muse

μ's (pronounced "Muse") is a school idol group in the ''Love Live! School Idol Project'' anime. They're the school idol group of Otonokizaka High School. The group consists of nine members. The group was initially formed with the purpose of preventing their school from closing.

Songs
All μ's songs and albums can be found here.

Chronology
Although not as an official club, the group is formed at the end of Episode 1 when Kotori brings Umi to show her Honoka practicing to become an idol, and they both decide to join Honoka. The club registration, however, is rejected by the student council president, Ayase Eri, because of both their intention and the lack of members. However the vice president, Toujou Nozomi, advises them to find at least five members, the requisite number to officially form a club.

They perform their first live concert in the school auditorium and sing the song Start:Dash!! in Episode 3, composed by Maki with the original lyrics by Umi. Hanayo turns up to the concert, followed by her friend Rin and are the main audience. Niko, Maki, Nozomi, and Eri, who records the whole performance, secretly listen to their concert. It is later uploaded to the internet by Eri.

In Episode 4, the group gains three more members: Hanayo, Rin and Maki. At first, they seem to be reluctant to join the group, but after some time, they finally join the group. In the next episode, Episode 5, one more member is added to the group, Yazawa Niko. She tried to dismiss the group due to her jealousy of their success, but when all of her attempts failed, she decided to join the group instead. This make the group consist of seven idols, commemorated with a single named Korekara no Someday (これからのSomeday).

Much later in Episode 8, the group finally get another two members, Nozomi and Eri, making the count increased to nine. This, as explained by Nozomi, fulfilled the myth behind their name "μ's," which actually originated from the nine Greek goddesses of music. This moment is then celebrated with their full member debut during the school festival. The song they sang was Bokura no LIVE, Kimi to no LIFE (僕らのLIVE,君とのLIFE).

Trivia

 * In reality, the group name "μ's" was decided through a cellphone poll by fans in November, one month after the release of their first single Bokura no LIVE, Kimi to no LIFE (僕らのLIVE,君とのLIFE) in August 2010.
 * Other polls also determined the names of the mini idol units Printemps, BiBi, and Lily White.
 * Based on cellphone polls, the member with the most votes would be given the center position of the next music video. For example, Niko was the center of Natsuiro Egao de 1, 2, Jump! (夏色えがおで1,2,Jump!?) because she won a poll.
 * Polls also determined the idols' hairstyles and costumes for the music video.