Though available, read What Music!: The Fifty-year Friendship between Beethoven and Nannette Streicher, Who Built His Pianos via an online reader copy. Laurie Lawlor created a story that is more on the friendship and Beethoven’s life than the actual pianos Streicher built. It is an interesting look into their lives, through an outlet not usually used. While you might learn a few new things about Streicher, overall, there might not be a lot of new for Beethoven. This picture book is not to be considered a pure biography, but a highlight of part of their lives.
It is the artwork of Becca Stadlander that gives most of my rating of four. They fit the more serious tone of Lawlor’s text, but are busy and colorful so they have an active feel too. They reflect the time, place, history of things. Classically looking, the text is more modern in tone.
Several extras are included at the end that dives deeper into the life of Beethoven. But since there is little surviving in the way of artifacts for Streicher, we know less about her and her personal life. Of course, what is presented because of what we do know is important, because not only was she a person who moved women’s history, she moved musical history by having a decades long friendship with an influential person of their time. 
Great for the personal, school or classroom library, though in a picture book format it might turn off the older reader, but is good for that first to young third grade reader or read aloud.