I wonder whether a possible audio similarities analyzer would be capable of detecting influences described by the creators themselves. For example, in a podcast, Tal Bachman said that making his most famous hit "She's So High" started when he heard the chorus of "If It Makes You Happy" by Sheryl Crow in a supermarket. After that revelation I now can not unhear it and the choruses of those songs are connected in my brain. But the connection is not that obvious.