Can anyone learn to sing?
Nearly everyone can learn to sing in tune with a pleasant, reliable sound. Singing is mostly a set of skills — matching pitch, breathing steadily, shaping vowels, moving between registers — and skills improve with practice. Voices do differ in size, colour and natural range, so not everyone will sound like a particular singer, but the gap between "I can't sing" and "I sing well enough to enjoy it" is usually practice rather than talent. Checking whether you can match a single note shows where you are starting from.