The `Foundations` singer - who also plays bass in punk band The Receeders - came up with the beginning of her hit tune `Mansion Song` spontaneously and had to write the lyrics in a text message.
She told Beatweek magazine: "I wrote that on a text message on the phone because it really just came straight out of me, didn`t need to edit it or anything, really. I`m not really good at editing my work. I`m better at just doing it."
Kate says the most satisfying thing about songwriting for her is having the opportunity to express herself.
She said: "Too many people are bland and afraid to have an opinion, because people will say, `Oh, it`s so shocking, oh it`s this,` or it`ll be reactionary, and it`s like, `Who cares?` "
The singer - who recently released her new album `My Best Friend is You` - is also dismissive of the current crop of successful young female British artists, such as Pixie Lott and Little Boots.
She explained: "I actually think it`s so damaging when I hear people saying, `Oh it`s so great - all these young female artists are doing so well.`
"I`m like, `No, because big manufactured labels think that`s what sells.` So they invent a bunch of pretty girls to do something alternative and build their indie careers when they`ve been signed to a major the whole time."