The King's College Choir is one of today's most accomplished and renowned representatives of the great English choral tradition. It was created by King Henry VI, who founded King's College, Cambridge, in 1441, to provide daily singing in his Chapel, which remains the main task of the choir to this day. Today the choir is directed by Stephen Cleobury and derives much of its fame from the Festival of Nine Lessons and Carols, broadcast worldwide to millions on Christmas Eve every year, and the TV service Carols from King's which accompanies it. The choir commissions a carol from a contemporary composer for each year's Festival.

By the 1860s it was recognised that musical standards in the choir needed improvement.John Jebb's 1843 enquiry into Anglican choirs found that "in Cambridge, the Choral Service has suffered mutilation in every place where it is retained. King's College has reduced the original number of its Conduct Chaplains from three to one; and though retaining its sixteen Choristers (which evidently were intended to be proportionate to a more numerous body of adult singers), there are but a small number of Clerks, too weak for the magnificent organ which accompanies them, and for the unrivalled Chapel where they minister. The Choir indeed attends twice daily; but the prayers are not chanted (a very modern innovation), and at the Sunday morning service the Nicene Creed is not sung.". Amongst the lay clerks, whose duties were at this time divided by also singing at Trinity, indiscipline and absenteeism were common.  Reform began after the passing of the Cambridge University Act 1856, which enabled the statutes and governance of the college to be altered. Two chaplains and twelve lay clerks were specified, and sharing duties with Trinity was ended in 1871. The same year a new Master over the Choristers was appointed, who was tasked with being "watchful of their moral conduct" and "maintaining disciple without undue severity at all times". Conditions for choristers were improved with the intention of recruiting boys from a higher social background. They were given instruction in instrumental music and financial assistance upon leaving.  To further widen the field for selection it was decided to open a boarding school instead of paying for choristers to be lodged with local families. From 1876 it was decreed that choristerships should be open to all candidates "whether resident in Cambridge or elsewhere" with those resident outside the city lodged at the expense of the college, and a purpose-built King's College School was opened two years later. Also in 1876 it was decided that choral scholarships were to be awarded, with students replacing the permanently employed lay clerks. Existing contracts meant this was a slow process, with the last clerk leaving in 1928.  1876 also saw the appointment of a new organist on an increased salary, Arthur Henry Mann. There was little if any formal training of choir instructors at this time in England - most were organists who taught the choir following whatever technique they themselves had been subjected to as former choristers. Mann was fortunate in this regard having been a chorister at Norwich Cathedral under the renowned Zechariah Buck. Mann was therefore an outstanding choir trainer himself and greatly improved the reputation of King's College Choir. He worked on improving the diction and timing of the choir to allow them to work with the acoustic of the chapel and its particularly lengthy reverb. He also opened up services to the public, where previously visitors needed written permission to attend.

Using a quote from the above article, answer the following question: who or what was Trinity