If you search for "Musixmatch Premium 750," you won't find a price tag of $750 (that would be absurd). Instead, this keyword usually refers to one of three things:
Remove all advertisements for uninterrupted browsing and listening.
Musixmatch Premium enhances the listening experience by removing ads and adding utility for active music fans: Musixmatch Word-by-Word Sync
Disclaimer: Prices and pack names are subject to change based on regional App Store updates. Always verify the subscription length before confirming payment.