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By singing, patients use a different area of the brain from the area involved in speech.
If a person's "speech centre" is damaged by a stroke, they can learn to use their "singing centre" instead.
Researchers presented these findings at the annual meeting of the American Association for the Advancement of Science (AAAS) in San Diego.
An ongoing clinical trial, they said, has shown how the brain responds to this "melodic intonation therapy".
Gottfried Schlaug, a neurology professor at Beth Israel Deaconess Medical Center and Harvard Medical School in Boston, US, led the trial.
The therapy is already established as a medical technique. Researchers first used it when it was discovered that stroke patients with brain damage that left them unable to speak were still able to sing.
Professor Schlaug explained that his was the first study to combine this therapy with brain imaging - "to show what is actually going on in the brain" as patients learn to sing their words.
Making connections
Most of the connections between brain areas that control movement and those that control hearing are on the left side of the brain.
"But there's a sort of corresponding hole on the right side," said Professor Schlaug.
Brain sounds
Dr Aniruddh Patel from the Neurosciences Institute in San Diego, said the study was an example of the "explosion in research into music and the brain" over the last decade.
"People sometimes ask where in the brain music is processed and the answer is everywhere above the neck," said Dr Patel.
"Music engages huge swathes of the brain, it's not just lighting up a spot in the auditory cortex."
Dr Nina Kraus, a neuroscientist from Northwestern University in Chicago, also studies the effects of music on the brain.
In her research, she records the brain's response to music using electrodes on the scalp.
This work has enabled her to "play back" electrical activity from brain cells as they pick up sounds.
"Neurons work with electricity, so if you record the electricity from the brain you can play that back through speakers and hear how the brain deals with sounds," she explained.
Dr Kraus has also discovered that musical training seems to enhance the ability to perform other tasks, such as reading.
She said that the insights into how the brain responds to music provided evidence that musical training was an important part of children's education.
Source: BBC
My son, who is now 25 years old, had major difficulty with speech until he was almost 10. He was born with Down's Syndrome and received speech therapy from the age of 3 years on, without much improvement in his ability to talk. But, when he got a CD player for his birthday at age 9, he began playing music and singing along with the music ALL day long - and from that point on, his speech steadily improved. It was a beautiful thing to observe!