Study	Reason for exclusion
Calik‐Kutukcu 2016	Investigation of the effects of music listening during exercise in people with CF.
Chung 2011	Not an intervention study, but a summary of complementary and alternative therapies for children with a respiratory condition.
Frias 2018	Intervention did not include singing, but listening to specially composed music during chest physiotherapy.
Goldbeck 2014	A Cochrane Review of psychological interventions for people with CF.
Goldenberg 2012	Not an RCT, but a collective case study on the effects of voice lessons on pulmonary function and quality of life in adults with CF.
Goldenberg 2018	Not an RCT ‐ a literature review on the benefits of singing.
Grasso 2000	Intervention is not singing, but using pre‐recorded music during daily chest percussion routine with toddlers.
Grossoehme 2014	Parents of children with CF included looking as using spirituality to deal with stress; singing was not explored.
Irons 2014	A qualitative study, exploring the benefits of singing for children and young people with CF
Kaak 2011	Intervention is not singing, but playing the didgeridoo.
Kamioka 2014	A systematic review of the effects of music therapy interventions.
Kemper 2005	Not an RCT; did not explore singing; did not include people with CF.
Main 2005	A Cochrane Review of physiotherapy for people with CF.
Moola 2012	Qualitative study; did not explore singing.
Mrazova 2010	A systematic review of music therapy for children; not singing.
Reichardt 2011	People with CF were not included; a observational study on Hustifex®‐Brummer® ‐ a singing method specially developed for people with COPD.
Roux 2007	Intervention is not singing, but listening to music; people with CF were not included.
Whitehead 2018	A review summary on singing as an adjunct therapy for children and adults with CF.

CF: cystic fibrosis
 COPD: chronic obstructive pulmonary disorder
 RCT: randomised controlled trial