Communication disorders after stroke (aphasia) are common (around 30%), and even more widespread in other neurological disorders, with 90% of people with Parkinson's Disease (PD) having problems with speech/swallowing. Recent small-scale studies indicate choral singing improves voice, breathing and quality of life in neurological patients and older adults. Singing is inexpensive, enjoyable, accessible and spans many cultures, and would potentially be a valuable therapy option. This study will establish important data to underpin a study of the impact of singing and choir participation for people with PD and stroke. With the Centre for Brain Research CeleBRation Choir we will test the feasibility of conducting a future controlled trial of therapeutic outcomes, using qualitative and quantitative approaches. Participant recruitment/retention and acceptability/stability of repeated measures of voice, language, health and wellbeing will be investigated. Perceived barriers to choir and research participation will be assessed through interviews with choir members and community groups.