A Vietnam War veteran has been suffering from songs being stuck in his head for weeks at a time in a condition that doctors think may be linked to his service. Gregg Manderson, 68, of St Paul, Minnesota, first sought medical attention after he got Twinkle Twinkle Little Star trapped inside his mind last May, setting off nearly twelve months of doctors his mind shuffling between tunes that are stuck on repeat. He has also hallucinated the theme song to the western 1950s television show Cheyenne had the same mysterious bugle call stuck in his head for years. Minneapolis VA Medical Center neurologist Dr Khalaf Alla Bushara and researcher Roger Dumas have looked for a way to end the earworm, though they have yet to find a cure for the military-style revelry. Scroll down for video . Gregg Manderson, 68, of St Paul Minnesota, has sought medical help after Twinkle Twinkle Little Star first became stuck in his head last May. Sounds including police sirens are stuck in his head for around a month . 'These men and women who served, their service still influences their lives even years later,' Dr Bushara told KARE11. The doctor said that the hallucinations occur in those in hearing loss, when the brain compensates for a lack of stimulation by making its own sounds. Dumas, who used to make drum machines and synthesizers for Janet Jackson and Prince before he got into science, said that music hallucinations are different from how a normal person has a song stuck in their head. He told Daily Mail Online that patients such as Manderson experience their hallucinations as sound, rather than have the consciousness that it is only stuck in their head. Manderson will often be listening to the same song for a month before something new appears, though some, like the bugle call, never leave. He thinks that his mind made up the sound, which no one else can put a name to, though he likes it better than other sounds such as the police sirens that circled around his brain for a week. Roger Dumas, a cognitive science researcher who used to make synthesizers for Prince, helped Manderson identify the song in his head and says the tune is unique because it is self-composed . Dr Khalaf Alla Bushara (left) of the Minneapolis VA Medical Center (right) is trying to help cure Manderson by playing the song repeatedly in hopes that he will tune it out . Dumas said that music hallucinations are most often songs that everyone else knows such as 'Twinkle Twinkle', making Manderson's self-composed song fairly novel. The call was particularly frustrating when he first brought it to the attention of doctors, as he did not know what it was. He originally described it as some sort of brass instrument, and was only able to narrow it down with Dumas's knowledge of synthesizers and knack for creating sounds described by others such as musical artists. 'I'm getting used to it, but I don't like it,'Manderson said of the condition. Dr Bushara is trying to help him rid himself of the current bugle call by playing the song repeatedly in hopes that his patient will tune it out. Musical hallucinations are most common in older people and often bring back melodies heard during youth. Manderson's father was a jazz saxophonist, according to TwinCities.com.
Gregg Manderson, 68, of St Paul, Minnesota, has auditory hallucinations .
He sought help for Condition  last May when lullaby Twinkle, Twinkle Little Star crept into his head .
Songs, which have included  police sirens, last for about a month, but for years he has heard a bugle call that could be linked to his time in Vietnam .
Manderson originally didn't know .
Theme song to the 1950s Western show Cheyenne also often in his mind .