You can make life much easier for blackbirds by mulching your flower beds with leaf-litter, keeping your lawn mown, planting fruiting shrubs and trees (especially dense, thorny ones) and planting climbers against walls.
A lovely surprise and treat to see a Thrush in my garden. I've seen them by the brook but not in the garden for a long time) Thrush - Song. One of my favourite birds. Sadly there are fewer of them these days.
The Song Thrush is also known as throstle or mavis & has brown upperparts & black-spotted cream or buff underparts. It's distinctive song, which has repeated musical phrases, has frequently been referred to in poetry. It builds a neat mud-lined cup nest