As the pair improved, the research team increased the distance between the chime bars to encourage the patients to play further into their left side of space.
Following the sessions, the authors said that both participants showed "significant improvement" in clinical tests for "neglect".
Dr Lauren Stewart, from the music, mind and brain team based in Goldsmiths' Department of Psychology, said: "Despite a good deal of research into rehabilitation approaches, treatment options are limited.
"Our research shows that playing a musical instrument could be an effective intervention for neglect patients.
"It would be great to invite more patients to participate in future studies, as well as see if the music intervention has the capacity to translate to improvements in everyday tasks."
The team of researchers are now planning to expand the small study into a formal clinical trial to determine the full impact of the intervention.
- PAA