Gerald Wirth became the choir's artistic director in 2001. However, since then, the choir has come under pressure to modernize and has faced criticism of their musical standards, leading to a split with the Vienna State Opera. The choir has for the first time had to advertise for recruits after a rival choir school was established by Ioan Holender, director of the opera company. He complained of both falling standards and poor communication with the choir. He said that the State Opera sometimes trained boys for particular stage roles, only to find out on the day of performance that they were unavailable as they had gone on tour with the choir. Some boys were attracted to the rival choir school by the prospect of a more relaxed atmosphere and of performance fees being paid directly to them.  The Vienna Boys' Choir has sought to update its image, recording pop music selections and adopting an alternative uniform to the sailor suits used since the 1920s, allowing the boys to dance as they sing. After Eugen Jesser died in May 2008, Walter Nettig became the choir's president. Gerald Wirth has been the artistic director since 2001, and he also became the choir's president in 2013.  In 2010, following sexual abuse allegations from two former choristers stemming from the late 1960s and early 1980s, the Vienna Boys' Choir opened a confidential phone and e-mail hotline to allow others to come forward. Eight possible victims came forward saying they were abused, either by staff or other choir members.

Answer this question "what changes did they make?" by extracting the answer from the text above.
The Vienna Boys' Choir has sought to update its image, recording pop music selections and adopting an alternative uniform to the sailor suits used since the 1920s,