I use Apple Music so artists get paid a little more (and not alt-right conspiracy theorists), and they do have Replay, but it doesn't have as user-friendly a page that shows everything in one place.

So top 5 artists and songs? Here's the raw data:

Artists:

1. ONE OK ROCK, 3,539 minutes
2. THE SIXTH LIE, 1,707 minutes
3. ReoNa, 1,500 minutes
4. Enya, 1,438 minutes
5. AmaLee, 1,234 minutes

Songs:

1. Virtual Sky (THE SIXTH LIE), 97 plays
2. Watashitachi no uta (ReoNa), 79 plays
3. +Matter (ONE OK ROCK), 74 plays
4. Yofukashino Uta (Creepy Nuts), 73 plays
5. Make it Out Alive (ONE OK ROCK), 73 plays

ONE OK ROCK and THE SIXTH LIE are Japanese rock bands. ReoNa is a Japanese musician who does everything from pop/dance to rock/hard rock. Enya is an Irish singer in a genre of her own making, but most often classified as New Age (a label she rejects). AmaLee is a YouTuber who covers Japanese songs in English. She sings, and the music is performed by other people. AFAIK she doesn't have a consistent band. And Creepy Nuts is a Japanese hip-hop/rap duo. I like Japanese music, and I like weird stuff (like Creepy Nuts and Enya).