Yesterday I was listening to the 'Silent Invocation C' first time (properly) from the album 'Connection' and found out the similarity of the flute's tune with the Islamic salaato salaam called "Ya Nabi Salaam Alayka". Listen to it from 0:35. In 'silent invocation' the tempo is bit slower just that's a difference bitween both the tunes.
http://www.youtube.com/watch?v=6_QN4nbusfk&feature=related I m not saying that its a copy but I think its a good thinking of ARR to use that tune in 'invocation' as that tune is really melodious n soothing perfect for the invocation.