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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Gmusicbrowser is pretty good feature-wise. It's very configurable and has many different layouts. It might not look very modern by default, but with a modern gtk theme and some fiddling it looks okay to me at least.
For now I stay with Cantata as it once was Kubuntu's default player: https://github.com/CDrummond/cantata (archived). Not in active development but still available in Ubuntu 22.04 LTS repos and therefore I assume also in Debian. Don't think however it has the modern looks you want.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.