7 June – First performance of Peter Grimes in Sadler's Wells, London.
29 June - William Walton opposes a proposal that the British Council should support a complete recording of Peter Grimes, suggesting that this should be discussed "at a calmer moment when the wildly hysterical & uncritical eulogies & general 'ballyhoo' have somewhat abated, & the true merits of the work can be properly assessed."
July – Benjamin Britten and Yehudi Menuhin tour Germany to perform concerts in liberated concentration camps, including Belsen.
26 July - Composer Ernest John Moeran marries cellist Peers Coetmore.
Unknown date - Walter Legge founds the Philharmonia Orchestra.
Dorothy Squires - "The Gypsy" (Billy Reid)
Benjamin Britten – The Young Person's Guide to the Orchestra
Michael Tippett - Symphony No. 1
William Walton - Memorial Fanfare for Henry Wood
Benjamin Britten – Peter Grimes
Richard Addinsell - Blithe Spirit
Ralph Vaughan Williams - The Story of a Flemish Farm
21 April - Perchance To Dream (Music, Lyrics and Book: Ivor Novello) - London production opens at the London Hippodrome and runs for 1022 performances.
28 August - Noël Coward's revue Sigh No More opens at the Piccadilly Theatre.
Flight from Folly, directed by Herbert Mason, starring Patricia Kirkwood and Hugh Sinclair. The Daily Mirror described the film as a "neatly made and tuneful comedy" with praise for Kirkwood's "vivacious personality and talent".
I'll Be Your Sweetheart - directed by Val Guest, starring Margaret Lockwood, Vic Oliver and Michael Rennie.
10 January - Rod Stewart, singer and songwriter
19 January - Trevor Williams, English singer-songwriter and bass player (Audience and The Nashville Teens)
25 January - Dave Walker, English singer and guitarist (Savoy Brown and Fleetwood Mac)
26 January - Jacqueline du Pré, cellist (died 1987)
30 March - Eric Clapton, guitarist, singer and songwriter
25 February - Elkie Brooks, singer
14 April - Ritchie Blackmore, guitarist
19 May - Pete Townshend (The Who)
29 May - Gary Brooker (Procol Harum)
24 June - Colin Blunstone, singer
25 June - Labi Siffre, singer-songwriter
28 June - David Knights, bass player and producer (Procol Harum)
19 August - Ian Gillan, singer
5 September - Al Stewart, singer-songwriter
7 September - Max Boyce, singer-songwriter
24 September - John Rutter, composer
26 September - Bryan Ferry, singer and songwriter
5 October - Brian Connolly, vocalist (Sweet) (died 1997)
28 October - Wayne Fontana, singer
3 December - Paul Nicholas, actor and singer
30 December - Davy Jones, singer and actor (died 2012)
8 February - James Campbell McInnes, baritone singer and teacher, 71
12 April - Maurice Besly, organist, composer and conductor, 57
24 April - Hubert Bath, film composer, 61
21 May - Hugh Enes Blackmore, singer and actor, 81
15 August - Frederic Lord, organist, conductor and composer, 58
19 November - Helen Hopekirk, pianist and composer, 89
15 December - Tobias Matthay, pianist and composer, 87
1945 in British music Wikipedia
This is a summary of 1945 in music in the United Kingdom.