Pop star Madonna has staged an impromptu concert at Paris' Republique plaza to honor victims of the Nov. 13 attacks in which 130 people died.<br />The singer, who had just finished her show in Paris Wednesday evening, tweeted to her fans: "Im singing some songs in place de la republique.<br />Meet me there now."<br />Accompanied by a guitarist, she performed songs including John Lennon's "Imagine" a song that became an unofficial anthem in the aftermath of the attacks.<br />The iconic statue at Republique, transformed into an informal memorial since the attacks, is piled with flowers and candles left by passers-by.
