To create a new message notification sound for a minimalistic premium messaging app, I envision a short, clean, and unobtrusive alert. The tone should be gentle yet noticeable, avoiding anything jarring or overly complex.

Tone: Subtle, positive, and attention-grabbing without being jarring. Think "gentle chime" rather than "loud alarm."

Length: Very short, ideally under one second. Anything longer risks interrupting the user's flow. A range of 0.5 to 0.75 seconds would be ideal.

Specific Instruments or Sounds: I propose a single, clear, high-pitched tone, possibly a synthesized bell-like sound or a plucked string instrument (like a clean, bright acoustic guitar). Avoid any harsh or metallic sounds. The sound should be crisp and clean, with no reverb or echo.

Intended Use: Message notification within a premium messaging app. The sound should reflect the app's high-quality and minimalist design aesthetic.

Additional Features or Customizations:

• Volume: The volume should be moderate, easily audible but not overwhelming, even in quiet environments.
• Pitch: A slightly upward inflection at the end of the sound could add a touch of pleasantness and subtly signal the arrival of a new message.
• Format: Export in multiple formats (e.g., WAV, MP3) to ensure compatibility across different devices and operating systems.
• Variations: Consider creating a subtle variation of the sound for group messages, perhaps slightly longer or with a slightly different pitch. This would provide auditory differentiation without being overly complex.

The overall goal is to create a sound that is both effective in alerting the user to a new message and consistent with the app's premium and minimalist design philosophy. The sound should be elegant, unobtrusive, and memorable.