That would be the boring way to describe Cullum (though it is all true). But who is the man behind the music?
Cullum is best described by the word 'spontaneous'. The 31-year-old just goes with the flow when it comes to picking which song he would cover next and give the Jamie Cullum treatment to.
There is also no set list for his performances and the music he composes cannot be pigeonholed into any one 'genre', a term which Cullum derides as a kind of journalistic term", before explaining that modern music has such diverse elements that it becomes inaccurate to classify them under any one 'genre'.
Cullum prefers to go where inspiration (and his imagination) takes him when it comes to creating new songs, fusing jazz with various other musical styles, ranging from pop, rock to hip hop.
It is this unpredictability and spontaneity that attracted him to jazz, and it is also what he believes attracts people to his music and his concerts.
The spontaneity of jazz is what attracts me to it, its ability [to make] a song you play every night sound different every night," said Cullum, during a press conference at the Mandarin Hotel on Monday for his sold-out concert in Singapore.
It's about giving a certain amount of reinvention to music every night, although that can lead to slightly unpredictable performances. It also means that there is a different level of excitement and unpredictability every night."
While Cullum was all smiles and happy to talk about his new album, music and career, his marriage to famous writer Doald Dahl's granddaughter, former-model Sofia Dahl in January, was strictly off limits.