Music Formats

MP3 (MPEG-1/2 Audio Layer III): lossy format widely supported; good balance of quality and file size.
AAC (Advanced Audio Coding): efficient lossy format; often higher quality at similar bitrates compared to MP3.
WAV (Waveform Audio File Format): uncompressed; large files; high compatibility for editing and mastering.
FLAC (Free Lossless Audio Codec): lossless compression; preserves original quality with smaller file sizes than WAV.
ALAC (Apple Lossless): lossless format optimized for Apple devices and ecosystems.
AIFF (Audio Interchange File Format): uncompressed; common in professional workflows; similar to WAV.
OGG (often in the form of OGG Vorbis): open-source lossy format; good quality at lower bitrates.

Lossy vs Lossless:
- Lossy formats (e.g., MP3, AAC, OGG): smaller file sizes; some data removed to reduce size; perceptual tuning.
- Lossless formats (e.g., FLAC, ALAC, WAV, AIFF): no data lost; identical reproduction of the source.
Bitrate and quality:
- Higher bitrates generally yield better sound quality, with diminishing returns beyond certain thresholds.
- Typical consumer listening ranges: 128–320 kbps for lossy; lossless at 16–24-bit depth and 44.1 kHz or higher for CD-quality or better.
File size considerations:
- Lossless formats produce larger files; ideal for archiving, mastering, and high-fidelity playback.
- Lossy formats save space for portable devices and streaming.

Streaming services often use: AAC or Ogg Vorbis at adaptive bitrates; dynamic quality based on connection.
Downloads commonly offered as: MP3, AAC, FLAC, or WAV depending on the service and user preference.
For offline listening on limited storage, lossy formats at appropriate bitrates are practical; for archival or critical listening, lossless is preferred.

General listening on mobile devices or browsers: MP3 or AAC at 128–256 kbps, or AAC for better efficiency.
High-fidelity home audio or critical listening: FLAC or ALAC if compatibility allows.
Editing, mixing, or mastering: WAV or AIFF for maximum fidelity during workflow.
Open environments or equipment with limited codec support: consider MP3 or OGG for broader compatibility.

Check device and platform support before selecting a format.
If streaming quality is variable, consider downloading lossless copies for stable playback when possible.
Maintain a master archival copy in a lossless format and create smaller, portable copies for everyday use.
Use consistent tagging (ID3 for MP3, Vorbis Comments for OGG, or equivalent) to keep library metadata accurate across formats.