I am a professional musician (bassoon player in a symphony orchestra). I can, if I practice it a couple of times a week, achieve and sustain perfect pitch. I had no semblance of perfect pitch until I decided to practice it at age 24. Before that the only chance I had to guess a note was to put in in relation to my own voice. Even though I don't practice this anymore (it isn't very useful), I still often just instinct…
Cellist for the last 35 years here. No perfect pitch. My "perfect" note identification is based on timbre: I know what each note sounds like on the instruments I know intimately. For synthetic tones, I will be off +/- 3 semitones because I will be using an aural memory of the cello a string as a reference, rather than recognizing the frequency like the perfect pitch folks do. Never occurred to me to practice perfect…
Having perfect pitch can be useful for a lot of musicians, or educators, or composers in various ways, including:
Improving accuracy in performance: Perfect pitch can identify and reproduce musical notes more accurately and quickly, which can help perform music with greater precision.
Improving music education: Perfect pitch can help people teach music theory and composition more effectively, as students with perfect pitch can better understand and apply the concepts.
Enhancing creativity in music composition: Composers with pitch can more easily hear and reproduce musical ideas in their heads, which can help them create more complex and interesting compositions.
Facilitating communication among musicians: Musicians with absolute pitch can communicate more effectively with each other by using a common standard for identifying notes.
Improving the ability to transcribe music: Musicians with perfect pitch can more easily transcribe music by ear, which can be useful for analyzing and studying music.... the list goes on