Soft Flowing Avon was a 1769 song

Song

In music, a song is a composition for voice or voices, performed by singing.A song may be accompanied by musical instruments, or it may be unaccompanied, as in the case of a cappella songs...

 with music written by Thomas Arne and lyrics by David Garrick

David Garrick

David Garrick was an English actor, playwright, theatre manager and producer who influenced nearly all aspects of theatrical practice throughout the 18th century and was a pupil and friend of Dr Samuel Johnson...

. It was composed for and first staged at the Shakespeare Jubilee

Shakespeare Jubilee

The Shakespeare Jubilee was staged in Stratford-upon-Avon between 5-7 September 1769. The jubilee was organised by the actor and theatre manager David Garrick to celebrate the jubilee of the birth of William Shakespeare. It had a major impact on the rising tide of bardolatry that led to Shakespeare...

 in Stratford-upon-Avon

Stratford-upon-Avon

Stratford-upon-Avon is a market town and civil parish in south Warwickshire, England. It lies on the River Avon, south east of Birmingham and south west of Warwick. It is the largest and most populous town of the District of Stratford-on-Avon, which uses the term "on" to indicate that it covers...

 in 1769. The lyrics refer to the River Avon which flows through the town, the birthplace of William Shakespeare

William Shakespeare

William Shakespeare was an English poet and playwright, widely regarded as the greatest writer in the English language and the world's pre-eminent dramatist. He is often called England's national poet and the "Bard of Avon"...

. The piece was later part of the Shakespeare Pageant performed at the Drury Lane Theatre

Theatre Royal, Drury Lane

The Theatre Royal, Drury Lane is a West End theatre in Covent Garden, in the City of Westminster, a borough of London. The building faces Catherine Street and backs onto Drury Lane. The building standing today is the most recent in a line of four theatres at the same location dating back to 1663,...

. The song and the Jubilee were part of the growing culture of Bardolatry

Bardolatry

Bardolatry is a term that refers to the excessive adulation of William Shakespeare, a portmanteau of "bard" and "idolatry." Shakespeare has been known as "the Bard" since the nineteenth century. One who idolizes Shakespeare is known as a Bardolater....

which sprung up in the eighteenth century.