David Samuel McWilliams (4 July 1945 – 8 January 2002) was a Northern Irish singer, songwriter and guitarist, best known for his 1967 song, "Days of Pearly Spencer".

Following a period of five months in Behan's household, Solomon was able to negotiate a contract with CBS Records, which released his first, unsuccessful single "God and My Country" in 1966, before signing McWilliams to his own new Major Minor label.

[3] This was a song about a homeless man McWilliams had encountered in Ballymena, and featured a sweeping orchestral arrangement by Leander and a chorus sung as if through a megaphone.

He sings in his normal voice into a telephone but the phone effect vocals are sung in various locations, such as the side of a canal.

)[6] Exposure on Radio Caroline and through advertisements in the UK music press in the summer of 1967 helped generate interest and sales in continental Europe, and the record was a Top 10 hit in numerous countries including France, Belgium and the Netherlands, selling a million copies worldwide.

He performed infrequently after that, mostly in local bars, although he also headlined a concert in aid of striking miners in 1984 and occasionally appeared at the Ballycastle Northern Lights Festival.