I do have a small collection of traditional SF ideas which I've never been able to sell. I'm known as a fantasy writer and neither my agent nor my editors want to risk my brand by jumping genre. ↗
I do very few standards. Hardly any. Other people's tunes that I do are usually obscure tunes, for the most part, although I do a couple of Duke Ellington tunes that are well known. ↗
I found my sound early on. Look at U2: they haven't changed their music for 20 years. Anyway, many people come unstuck when they try to change what they do and what they are known for. ↗
Franz Kline, who became known for his black and white paintings, did a whole series of gorgeous landscapes and wonderful portraits that may still hang in Greenwich Village. ↗