In the 2010s, while women constitute a significant proportion of popular music and classical music singers, and a significant proportion of songwriters (many of them being singer-songwriters), there are few women record producers, rock critics and rock instrumentalists. Women artists in pop music, such as Björk, Lady Gaga and Madonna, have commented about .....in the music industry. Additionally, a recent study led by Dr. Smith announced that "...over the last six years, the representation of women in the music industry has been even lower".