Delyth discovered barbershop in Plymouth in 1977 and sang baritone from the very start.  With Bristol Creme quartet she won LABBS quartet bronze and gold (1983) medals and the IABS International quartet trophy in 1992.  In 2012 her quartet K4 (with husband Dick and sons Joe and Tom) won silver medals in LABBS' inaugural mixed quartet contest.  She sings baritone alongside Dick in the mixed quartet Crown Derby which is the current BABS senior quartet champion.
Delyth has directed Brunel Harmony Chorus (now GraceNotes; LABBS), Coast to Coast (LABBS national chorus), Western Approach (BABS) and the Pilgrimaires (BABS).  In the spring of 2022 she became MD of EQ Rendezvous mixed chorus (BABS, the current European bronze medal chorus).  She is also lead section leader with GEM Connection ladies chorus.
Delyth certified as a LABBS Music Category judge in 2008.  She has judged national and international men's and ladies' chorus and quartet competitions in England, Ireland, Holland and New England, USA.  She directed college chorus streams at LABBS Harmony Colleges in 2003, 2005 & 2007, led workshops in 2016 and was dean of the Personal Development Stream in 2019.  From 2010 - 2015 she presented the "Theory of Harmony" course at BABS Harmony College, now part of the Personal Development stream and joined the Quartet Coaching Stream, online, for the first time in 2021.  She has coached a number of British choruses and quartets, including three BABS quartet championship winners.