Do not use reduce.
Try :
Array.from(new Set(songs.map(e => e.artist).sort()).values()).map(e => {let obj = {}; obj[e] = songs.filter(f => f.artist == e).length; return obj;})
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Do not use reduce.
Try :
Array.from(new Set(songs.map(e => e.artist).sort()).values()).map(e => {let obj = {}; obj[e] = songs.filter(f => f.artist == e).length; return obj;})