River Thames
The Water Music composed by George Frideric Handel premiered on 17 July 1717, when King George I requested a concert on the River Thames. The concert was performed for King George I on his barge and he is said to have enjoyed it so much that he ordered the 50 exhausted musicians to play the suites three times on the trip.
Hallische Händel-Ausgabe
The Hallische Händel-Ausgabe ("Halle Handel Edition") is a multi-volume collection of the works of George Frideric Handel. It was first published in the 1950s: initially as an adjunct to the HG edition, but by 1958 as a collected edition in its own right. The collection's abbreviation of "HHA" can be used to identify individual works by Handel, for example Handel's "Messiah" can be referred to as "HHA i/17" (with the Roman numeral "i" designating "series 1"). For practical use, the HHA numbering of Handel's works has been superseded by the HWV numbering system.