Cloud the bottom of the hierarchy. Clouds in the troposphere assume five physical forms based on structure and process of formation. These forms are commonly used for the purpose of satellite analysis. They are given below in approximate ascending order of instability or convective activity. "Non-convective" stratiform clouds appear in "stable" airmass conditions and, in general, have flat sheet-like structures that can form at any altitude in the troposphere. The stratiform group is divided by altitude range into the genera cirrostratus (high-level), altostratus (mid-level), stratus (low-level), and nimbostratus (multi-level). Fog is commonly considered a surface-based cloud layer. The fog may form
Digital sheet music or by typing text on the page (Hugh, 2013). Most recently, the rise of cloud computing is further pushing the development of digital sheet music and enables creating and sharing written music online. A cloud-based application is immediately available on the web on any type of computer and does not need to be installed. HTML5 in particular spurs cloud computing, allowing development of device independent web applications and making digital sheet music responsive and appropriate on large as well as on small screens. Cloud-based music notation applications facilitate the creation and sharing of written music. Additionally, other cloud-based applications focus