Mosaic的無伴奏合唱週年音樂會，是他們全年度最大型的演出。整個音樂會的籌劃，由劇本、選曲到宣傳、出版均是他們一手包辦。除了憑藉精彩的演出，以及首首動聽歌曲給場內各位觀眾帶來一個歡快的晚上外，Mosaic每次更會將這個音樂會的淨收益撥捐慈善組織，旨在透過音樂，將關懷傳遞給在音樂廳以外的有需要人士，為社會公益略盡綿力，這點亦正是Mosaic週年音樂會的獨特之處。這個既有好音樂，又富意義的盛會，每年皆是好評如潮，座無虛席。在過去數年，Mosaic的週年音樂會支持了不同慈善機構，包括國際十字路會、Samaritan's Feet、庭恩兒童中心、Project Little Dream、再皂福、新生精神康復會、兒童癌病基金、音樂兒童基金會及惜食堂。
此外，Mosaic自2012年港澳大專無伴奏合唱比賽開始舉行，便是其中常客，更有幸四度奪魁，其中於應屆 2016 年比賽獲得最佳主唱、本地組冠軍以及全場總冠軍共三個獎項。除了活躍於於本地，Mosaic亦有不少海外演出及比賽的經驗。例如於2008年赴台參加台灣國際當代無伴奏合唱節，次年再度獲邀；2009年則蒙澳門大學邀請，於澳門無伴奏合唱節中演出。在2010年，Mosaic更獲香港貿易發展局邀請到上海演出。同年，Mosaic在星加坡的國際無伴奏合唱比賽中，榮獲銀獎。在剛過去的2012及2013年中，Mosaic兩度於亞洲無伴奏音樂節大專無伴奏合唱比賽中奪得冠軍，同時亦再次於星加坡的國際無伴奏合唱比賽中奪得亞軍。2015年暑假，Mosaic獲上海亞卡貝拉藝術節邀請再赴上海演出，與亞洲各地的組合互相交流切磋，同時有幸得紐約著名組合Naturally 7指導，獲益良多。以上對所有團員而言，是一項莫大的鼓舞。
Mosaic is the premier A Cappella group based in The University of Hong Kong and comprises students from different faculties and years of studies. The name “Mosaic” was chosen to capture the very nature of the group – coming from different backgrounds, Mosaicians bring our individual uniqueness into harmonized pieces of lively, spirited music. Established in July 2006, Mosaic is the first collegiate A Cappella group in HK to organise large-scale concerts and has been very active in the Hong Kong choral scene, staging numerous performances both on and off campus.
Mosaic holds an A Cappella concert annually as their highlight event of the year. Mosaic debuted their first charity concert at HKU in December 2007. In 2009, the show upscaled and since then, Mosaic has made the annual concert their tradition. <Tribute to the TV Box> in 2009 was the start of the series, being unexpectedly well-received as Mosaic's first upscaled charity concert. Their success was continued by their second annual concert <College 5.5>, which vividly depicted their experience in the university. In the 2011 concert <Exclamation>, they shared their views towards life. In 2012, they did not talk about doomsday, instead creating <iMosaic> to share their experiences of using smart phones. In 2013, they shared views on dreams and hopes via music in their fifth concert, <Flight Mosaic>. In 2014, they shared the idea of “treasure every moment” with the audience in their concert, <Fast Forward!>. In 2015, they opened their hearts and embraced the audience with their concert, <Shall We Talk?>. In 2016, they came forward with <The Deal>, and offered the audience a world where wishes came true, but at a price.
While consistently giving full-house performances and sharing heartful music with their audience, Mosaic has also paid much attention to the community and people in need. Each year, the concert is dedicated to one charity and all net proceeds are donated. This is one reason that makes Mosaic annual concerts extra special and meaningful, earning them overwhelming appreciation and recognition over the years. In the past few years, Mosaic has partnered with different charities such as Crossroads, Samaritan’s Feet, Benji’s Centre, Project Little Dream, Soap Cycling, New Life Psychiatric Rehabilitation Association, Children's Cancer Foundation, Music Children Foundation, and Food Angel.
Ever since the installation of the Hong Kong and Macau College A Cappella Competition in 2012, Mosaic has been an active participant of this annual event, winning the competition among collegiate groups in the region on no less than four occasions, claiming their latest victory in 2016. Outside Hong Kong, Mosaic made its debut international performance at the 2008 International Contemporary A Cappella Festival in Taipei, and was again invited to join the Festival in 2009. In March the same year, Mosaic performed in the Macau A Cappella Festival upon invitation from the University of Macau. In 2010, Mosaic was invited by Hong Kong Trade Development Council to perform in Shanghai, and later that same year participated in Singapore International A Cappella Championship, claiming the Silver Award. Mosaic also got first runner up in the same competition the summer after. In addition, Mosaic won the Championship at the Asia A Cappella Festival Collegiate A Cappella Competition Champion for two consecutive years (2012 and 2013). Mosaic was also invited to the Vocal Asia Festival Shanghai in 2015, where A Cappella groups of various musical genres from all over Asia gathered. It is certainly a privilege to have been coached by world renowned group Naturally 7 during the festival.
Mosaic is dedicated to the promotion of A Cappella music in Hong Kong, hence often appearing on TV, radio, shopping malls and other major events.