Sales of Whitney Houston's music has been a popular download in the iTunes store and elsewhere online following her death on Saturday.  Now a controversy has developed after the prices to download her music went up.

The music giant is understood to have lifted the wholesale price of Houston's greatest hits album, The Ultimate Collection, at about 4am California time on Sunday. This meant that the iTunes retail price of the album automatically increased from £4.99 to £7.99.

Houston's The Ultimate Collection, originally released in 1997, was the second top-selling album on iTunes on Monday morning. Apple returned the album to its original price late on Sunday.

Did you purchase any of her songs after learning of her passing?