"Mr. Nilsen is a talented and driven young tenor with an outgoing personality and a great sense of humor. He has both a unique and memorable voice, with interesting color and timbre, as well as a natural musicality apparent in all his performances"
- Sherrill Milnes
"I found him to be a very focused young man with an excellent sense of musicality"
- Patricia McCaffrey
"He has a beautiful instument and a unique timber"
- Neil Rosenshein
"Mr. Nilsen is someone who, through his extraordinary musical gifts, already has achieved a high level in his singing. He possess an attractive, lyrical tenor voice, with an exceptional clarity, and distinct and expressive timbre"
- John Lidal