If you prefer official streaming apps, many offer "offline mode" which serves a similar purpose to downloading, though the files remain within the app's ecosystem: Amazon Music
The following sites are frequently used for batch downloads or extensive collections, ranked by their safety and quality:
Downloading zip files from unknown sources can pose significant risks to your device and personal data. These files may contain malware, viruses, or spyware that can compromise your device's security, leading to data breaches, financial losses, or identity theft. Moreover, such downloads often infringe on the intellectual property rights of artists and music producers, depriving them of their rightful earnings.