Question: Who has features  as a vocalist in "Let It Be" with Ferry Aid, Jim Diamond or Billy Milano?

Context paragraphs:
Jim Diamond (1988 album): Jim Diamond is Singer/Songwriter Jim Diamond's self-titled and third studio album.  Diamond was assisted by old friends Graham Lyle and Chris Parren, who had worked with him on previous albums.

Thrash of the Titans: Thrash of the Titans was a benefit concert held on August 11, 2001 at the Maritime Hall in San Francisco, CA.  The concert was a co-benefit for Testament vocalist Chuck Billy, who was diagnosed with germ cell seminoma (a rare form of cancer); and Chuck Schuldiner, leader of the death metal band Death, who was also battling cancer.  The Master of Ceremonies for the evening was S.O.D. vocalist Billy Milano.  The concert was organized by Walter Morgan.  The show was announced in May 2001, and all 2300 tickets quickly sold out.

M.O.D.: M.O.D. (abbreviation for Method of Destruction) is a crossover thrash band from New York City, fronted by Stormtroopers of Death vocalist Billy Milano.  The band has been around for 31 years (minus one hiatus from 1997 to 2001), and released eight studio albums.  With M.O.D., Milano sought to continue on the musical path of the bands Anthrax, Stormtroopers of Death and Nuclear Assault, mixing shades of hardcore punk with thrash metal and often humorous and politically incorrect lyrics.

I Won't Let You Down (Ph.D. song): "I Won't Let You Down" is a 1982 single by British band Ph.D. It entered the UK charts in April 1982 at #34 and peaked at #3 in May of that year.  The band consisted of Jim Diamond who was the lead vocalist, Tony Hymas on keyboards and Simon Phillips on drums.  It went on to become the 23rd best-selling single of 1982 in the UK.

Billy Milano: Billy Milano is a Bronx-born heavy metal musician now based in Austin, Texas.  He is the singer and - occasionally - guitarist and bassist of crossover thrash band M.O.D., and he was also the singer of its predecessor, Stormtroopers of Death.  He was also the singer of United Forces, which also featured his Stormtroopers of Death bandmate Dan Lilker.

20 Years of Dysfunction: 20 Years Of Dysfunction is a DVD/CD released in 2005 by crossover thrash band Stormtroopers Of Death.  Mainly created by singer Billy Milano, the material for the 2-disc DVD/CD is mostly culled from fan-shot amateur footage.  The relative scarceness of available material has resulted in some hilarious decisions by the production team; for instance, "Milk" is sung by Danny Lilker but the video footage inappropriately shows vocalist Milano singing.  Also notable is that the DVD does not include any material from the second Stormtroopers Of Death studio album "Bigger Than The Devil".

Jim Diamond (1993 album): Jim Diamond was Jim Diamond's first studio album in five years (not to be confused with its identically-named 1988 predecessor).  Featuring nine new songs and three re-recordings "Hi Ho Silver", "I Won't Let You Down" and "I Should Have Known Better".

The Best of Jim Diamond: The Best of Jim Diamond is a compilation album of tracks from Scottish singer-songwriter Jim Diamond's first two solo albums "Double Crossed" and "Desire for Freedom", along with B-sides.

Jim Diamond (singer): James Aaron Diamond (28 September 1951 – 8 October 2015) was a Scottish singer-songwriter, best known for his three Top 5 hits.  The first was "I Won't Let You Down" (1982), as the lead singer in the trio PhD, with Tony Hymas and Simon Phillips.  His solo performance, "I Should Have Known Better", was a United Kingdom No.1 in 1984.  The third track was the theme song from "Boon", "Hi Ho Silver" which reached No.5 in the UK Singles Chart in 1986.  He has also featured as a vocalist on the charity No.1s "You'll Never Walk Alone" with The Crowd and "Let It Be" with Ferry Aid.  His last UK chart success was with "Young Love (Carry Me Away)" in 1986.

Ferry Aid: Ferry Aid were a British-American ensemble group, brought together to record the song "Let It Be" in 1987.  The single was released following the Zeebrugge Disaster, which had occurred on 6 March 1987 involving the capsizing of the MS "Herald of Free Enterprise" ferry, which killed 193 passengers and crew.  All proceeds from sales of the single were donated to the charity set up in the aftermath of the disaster.  The recording was organised by "The Sun" newspaper, after it had sold cheap tickets for the ferry on that day.  "Let It Be" was written by Lennon–McCartney and originally recorded by The Beatles in 1969.

Supporting paragraphs: Jim Diamond (singer) Billy Milano
Answer: James Aaron Diamond