Chris Martin has hailed Rihanna "the Frank Sinatra of our generation".
The Coldplay frontman, 39, has compared the R&B superstar's singing voice to that of the late music legend - who passed away in 1998 of a heart attack - as he feels they both share a similar "thick tone", which he says sounds like "a beautifully squeezed tube of toothpaste" and is very hard not to like.
In an interview with the Guardian newspaper, he said: "She is the Frank Sinatra of our generation. She can turn anything into gold with that voice. Here's the little thing; if you speak to a good singing teacher about great opera singers, they will talk about consistency of tone. Or there's a book by Alfred Tomatis about why some people like certain people's voices and other people hate them, like Bob Dylan or me or whoever, some people say, 'Oh I hate that voice', so there's a thing about people's frequency responses - what they are pleased by.
"Rihanna has a thick tone, so it's very hard to annoy anybody. It's like a beautifully squeezed tube of toothpaste. When you think of Rihanna's voice you think of this whole, rich thing, solid like a tree trunk."
He also compared 'Hotline Bling' hitmaker Drake's voice to Rihanna and Sinatra's.
He added: "Drake is pretty similar. But Rihanna's voice is just delicious for your ear. Sinatra had the same thing; anything he sang sounded pleasing to most people."
Coldplay headline Glastonbury Festival on Sunday night (26.06.16) and Rihanna is reportedly set to fly in this evening (24.06.16) to party the weekend away.
Meanwhile, it is also rumoured that the 28-year-old Bajan beauty - who collaborated with the rock band on their hit 'Princess Of China' - could be set to join the 'Up & UP' hitmakers on stage, however, nothing has been confirmed.
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