Greene's Biographical Encyclopedia of Composers by David Mason Greene. Best classical music bathroom reading of all time. Not in print apparently but not at all expensive used.
Best single volume guide to classical music
For a Valentine’s Day present. Preferably fun to read. Doesn’t need to get deep into minuscia. At this point in our evolution, I could imagine one with QR codes to take the reader to great performances of pieces. Or a downloadable supplement! But I doubt that exists. Anyhow - thanks in advance.