THE RECORD INDUSTRY executive who signed Jimi Hendrix, Van Halen, Neil Young, The Kinks, Fleetwood Mac, Joni Mitchell, Van Morrison, Prince, Madonna, The Grateful Dead, Red Hot Chili Peppers, R.E.M. and many others who became stars has died in his sleep of natural causes at the age of 95. A self-effacing giant of the industry, Mo Ostin was known for the unflagging support he gave to his artists.