Conversation so far:
Why did Serebro change their record label
In January 2013, Serebro announced that they would release their further material in Japan after signing with EMI Music.
Why did Serebro choose Japan to release their further material in after signing with EMI Music
This was after the decline of Serebro's success after Mama Lover
What projects were Serebro working on after the decline of their success after Mama Lover
Serebro announced that they plan to release a compilation entitled Serebration that includes songs from their first and second studio albums.
Did Serebro work on anything else besides a compilation entitled Serebration that includes songs from their first and second studio albums?
Serebro traveled to Japan to promote the compilation album and to do a live concert tour.
Are there any more songs Serebro did after the compilation album and live concert tour
In March 2013, Serebro released their promotional single Sexy Ass, but it failed to chart in Russia.
Were there any other albums or songs by Serebro besides their promotional single Sexy Ass
In June 2013, Serebro released their single Mi Mi Mi which charted in Italy, peaking at 5 on the Italian iTunes chart.

Question: Are they popular?
Self-contained rewrite: Are Serebro popular?