I used to work with a lovely website that catalogued music teachers in the UK and got to write some articles for them about learning to play an instrument and becoming a successful musician.
The Harsh Realities of Making it in Music (this is a link to an archived version as the Modern Day Musician site no longer exists, but I like the article)
Why You Should Learn to Play an Instrument (wow there’s a photo from me in 2013 on this page! The piece is about how learning an instrument is beneficial to the development of children)
Don’t Get Stuck With the Triangle (how learning to play an instrument might be easier than you think)