There are multiple artists with this name:

1) Charlotte (しゃるろっと) is an Oshare Kei band with their concept based around 'school'; their official homepage titled 'Yokohama Charlotte School' and their visual style consisting of school uniforms. This reflects in their music which is light hearted punk rock.

2) Charlotte is Charlotte Nilsson-Perrelli, a female pop singer from Sweden.

3) Charlotte is Charlotte Kelly, a legally blind African-American female soul and house music singer who began in 1998 with her single, "Be Mine". She released her self-titled album, "Charlotte", in 1999. She followed with hits such as "Skin".

4) Charlotte is a german indie band from Bamberg/Frankonia.
With their first fee M.Monaco, Eddie Herkules und Max bought a candyfloss machine. But as music business is not eating candy they surely kept on practising.
Never having played an instrument difficulties were preassigned. But with the ambition to make girls go crazy, they finally began to observe and to study the performances of other bands.
They call themselves „Charlotte“ with good reason: girl names are more attractive - „Charlotte“ sounds good and is above all the ex girlfriend.
Their musicial style has also a special term -„Dreiakkordsport“: A headstrong, but unmistakable mixture out of beat, punk und rock’n’roll, combined with naughty lyrics. The songs are about lovesickness, drugs and bad elvis imitators and are as unspent as just like a refreshing tissue.
The future belongs to Charlotte! Even if the name belongs to the former girlfriend.