"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"

This quote by Joan Armatrading speaks to the value of finding and staying true to one's own sound. She recommendations U2 as an example of a band that has actually succeeded in keeping their noise for 20 years. Armatrading is recommending that when artists attempt to alter what they do and what they are known for, they often end up being unstuck. This might suggest that they become less successful, or that they lose their identity and the connection they have with their fans. Armatrading is highlighting the importance of remaining real to one's own noise and not attempting to change it excessive. This is an important lesson for any artist, as it is very important to remain true to one's own style and identity in order to stay effective and linked to their fans.