The composer Galina Ustvolskaya was possibly the closest to Dmitri Shostakovich: he asked, at one point to marry her.
But Galina had her own voice and retreated progressively into religious contemplation. According to her website, he gave only three interviews in her life, one of them to the Dutch journalist, Thea Derks.
She flares up when asked about Shostakovich. Read here. A compelling snapshot of an essential personality.
Extraordinary documentary below.
h/t: DSCH Journal