 Astrid recorded backing vocals for the track 'I Stopped My Car To Fill Up' on 'Performance & Cocktails' by Welsh indie band, The Stereophonics

Astrid reunited with Goya Dress producer, John Cale, for a live performance of his mixed media piece, 'Dead Agents' at the ICA, London in 1999

The song 'If I Loved You from her debut solo album "Boy For You" was covered by Abra Moore, retitled 'Someone Else's Mess' and featured in the film 'Serving Sara' 

Her first large-scale classical composition, "Requiem & Gallipoli", was first performed at Hessle All Saints' Church as part of a 2015 D-Day remembrance event, which raised funds for a local Hull veterans' charity and aimed to make people aware of Operation Warrior Wellness, a programme addressing veterans' post-traumatic stress disorder using transcendental meditation.Following her involvement as part of Dead Can Dance's 2012-3 touring band she collaborated with the band's Lisa Gerrard, co-writing 'Seven Seas' & 'Neptune' with her and 'Estelita' with Gerrard & Daniel Johns of Silverchair The resulting 2014 album 'Twilight Kingdom' also featured a cover of 'Too Far Gone' penned by Russell Crowe & Alan Doyle which was arranged and performed by Williamson & Gerrard.Her musical style is subtle, evocative and original and has been compared to Carole King and Joni Mitchell.