Piano is easily reproduced in headphones with 2 watts, and very hard to reproduce in speakers.
Proper piano has very high energy transients, pings, at the start of the note. This means amplifiers need to produce significant current (power) at the start of notes. No ping, may as play a Fender Rhodes "electric piano".
Piano has energy from 54 hz, the lowest note, to well over 10000 hz, the overtones of the top notes. This requires a speaker with very flat undistorted response over that range. The ones I own are specified +- 3 db 54 hz to 14,500 hz. The harmonic distortion on 2nd harmonic is specified at <20 db of the 1 W sound level at all frequencies. This kind of spec is very unusual. Most speakers sold to consumers don't even quote a +- db rating on the frequency response, which implies maybe +-10 db at best. A famous chain store speaker had a "production tolerance" of +- 30db, which meant their speakers sound like ****. These are the first speakers I've owned in 47 years as a hifi hobbiest, that actually can play a CD or LP and sound something like a piano. I've owned 3 generations of speakers, with my Mother's record player providing an additional learning experience of what equipment features I did not want.
The speakers I own are very sensitive, they produce 101 db @ 1 W 1 meter. With these speakers, I can play source material at a base level of 1/8 Watt for pp one note tracks, and can respond properly to FF ten notes at a time with only a 60 W/channel amp. However I suspect this amp can produce 200 W peaks for very short periods, ie the pings. Speakers with a more typical 84 db @ 1W 1m sensitivity would require much more power,
The speakers used, and a suitable 200 W/ch amp which was ailing when I got it, cost me a $1000. That is a bargain at that level of sound. I've since repaired the amp. $20 in parts, $100 in tools (I owned already) and a year or two of internet study in determining faults.
If you're a young struggling student, get used to wearing headphones or hearing *****y sound from your piano software sound generator. Makes $100 wood consoles you have to move yourself, tune yourself, unstick a key or replace a wire perhaps, look much more attractive.