"A R Rahman obviously is my favourite... I try to imitate him but cannot keep the magic intact... There is some magic in his fingers... It is impossible to imitate him," he told PTI in an interview here.
Kellerman said he was totally bowled over by Rahman's 'Bombay' theme track and a song from 'Slumdog Millionaire.'
The composer, who received the Grammy at the 57th Annual Grammy Awards for his 2014 album 'Winds of Samsara' in collaboration with Indian composer and producer Ricky Kej, was in the city, working on an ambitious project with the latter.
"I and Ricky have started to work for a very long ambitious project to be released in 2017, but that will be a followup of Winds of Samsara," he said.
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"Theme is always going to be good energy, love, peace and tolerance - that's the theme we would like to build on," he said.
Kellerman however said he doesn't like to make music having "sinister dimensions" though he has immense respect for those who create it.
"I don't like to make music that has sinister dimensions. For me all the music I make it can be deep but it is not dark. That's the music I like. It can be sad; it can be deep but I don't like to make music which is dark," he said.