Lessons learned: scale/arpeggio practices are indispensable, Bach's (harpsichord) compositions are superior, & careful, slow, meticulous concentration brings out excellence & virtuosity. A dozen exemplars mentioned, certain etudes & studies discussed, many exhortations to play authentically, and many more to perform not without the most sincere & strict attention to sound, touch, phrasing, and the like.
I enriched the reading (iBooks) by listening to some of the referenced pieces. More experienced musicians & pianists will probably know most or all of the names of teachers, virtuosos, & pedagogues that are mentioned in the book, but amateurs such as myself have atleast heard of some (Paderewski, Godowsky) and are familiar with some others (Hanon, Clementi). The field is so large that it takes some deliberation & verve to sit down and root out who is who & who did what. This book might only be for aspiring, amateur, or professional pianists, for it's all quite specific to the instrument, and addresses the more knowledgeable & well-versed of piano players by collecting dialogue from bona fide pianists of concert performance & of virtuosic capability. Rachmaninoff's in here, & Godowsky, and there are a couple women; they describe life travelling to & from Europe, draw comparisons between nations, and speak to the quiddities of devotion to the instrument; their lives are not all similar in origin, their perception of music refined, distinct, yet altogether uniformly of one entreating voice; and the reputation of them all is pronounced enough to warrant reflection for musicians who play in public the piano.
It's worth a look if you've got time, it's broken up into paragraph-like articles, and some points are common to most of their perspectives, like efficiently practicing, or carefully listening. I only had formal piano training (1 lesson/wk while at UC Riverside) for 4 years from 17-21 years old, started late and never entertained ambition in regard to learning the piano. Two hours' practice & study per day led to my ability to mechanically play a Bach invention but I had to continue outside of university & lessons, on my own, to merely retain the general skill. Over a decade I found spaces & periods of time to go through {scales, arpeggios, Hanon} and review what pieces I could play from {Bach, Chopin, Schubert, Mendelsohn, Beethoven}. Sometimes I had my own keyboard or upright at home & sometimes I trekked to studios to practice. Because I worked as a dancer in musicals & ballets, I was often around dancers & musicians, and I was encouraged & ultimately persuaded to try to play piano for ballet class. I never viewed myself capable but it was common for people to suggest ballet accompaniment to me. So off I went, searching for 16 & 32 measure music for ballet class, and after a year of vacillation, & of frustratingly rifling through uncut, unclear dance music, I finally landed my hands on actual books of music for ballet class--from there I was able to virtually replace the usual {scales, arpeggios, Hanon} w/{3/4s, 2/4s, 6/8s, & 4/4s} that were within my capacity to play. I never received great or extensive training, have no family background in classical music, & have hardly attended a concert in my life, but I always loved the piano sound & aspired to improve upon my playing, to the point where I 'fell into' a space of ballet class accompaniment. I went on to play piano accompaniment for ballet classes for four ballet schools (in San Diego), and after three years of real-time experience in public performance, I withdrew to return to practice, study, a conservation of my energy & a rehabilitation of my pride & integrity (playing music for the teacher & the students is a unique challenge, one made especially challenging if the teacher has not musical sensibility), and I now spend time studying more the classics so that I can challenge myself, improve, learn more about other composers & compositions, and transcend my limitations.