Tiiu started her musical education at the Heino Eller Music School in Tartu where she was taught by Vaike Uibopuu. In 2007 she continued her studies at the Estonian Academy of Music and Theatre with professor Ants Soots. In addition to Sireen, Tiiu is also the Chief Conductor of the University of Tartu Alumni Women's Choir and is one of the conductors during the Youth Song Festival 2017.
Tiiu and the sirens during the 26th Estonian Song Celebration "Touched by Time. The Time to touch" / Summer 2014