Question: The metafamily of graphical operating systems developed, marketed, and sold by Microsoft offers what kind of help to musicians?

full_context: Document 1: Microsoft Songsmith: Microsoft Research Songsmith is a musical accompaniment application for Microsoft Windows, launched in early 2009. Songsmith immediately generates a musical accompaniment after a voice is recorded. The user can adjust tempo, genre (such as pop, R&B, hip-hop, rock, jazz, or reggae), and overall mood (e.g. to make it happy, sad, jazzy, etc.).
Document 2: Windows NT 4.0: Windows NT 4.0 is a preemptively multitasked graphical operating system, designed to work with either uniprocessor or symmetric multi-processor computers. It was part of Microsoft's Windows NT family of operating systems and was released to manufacturing on 31 July 1996. It is a 32-bit operating system available in both workstation and server editions with a graphical environment similar to that of Windows 95.
Document 3: Microsoft Windows: Microsoft Windows, or simply Windows, is a metafamily of graphical operating systems developed, marketed, and sold by Microsoft. It consists of several families of operating systems, each of which cater to a certain sector of the computing industry with the OS typically associated with IBM PC compatible architecture. Active Windows families include Windows NT and Windows Embedded; these may encompass subfamilies, e.g. Windows Embedded Compact (Windows CE) or Windows Server. Defunct Windows families include Windows 9x, Windows Mobile and Windows Phone.
Document 4: Windows RT: Windows RT is a mobile operating system developed by Microsoft. It is an edition of Windows 8.x built for the 32-bit ARM architecture (ARMv7). First unveiled in January 2011 at Consumer Electronics Show, the Windows 8 RT operating system was officially launched alongside Windows 8 on October 26, 2012, with the release of three Windows RT-based devices, including Microsoft's Surface tablet. Unlike Windows 8, Windows RT is only available as preloaded software on devices specifically designed for the operating system by original equipment manufacturers (OEMs).
Document 5: Microsoft: Microsoft Corporation ( , abbreviated as MS) is an American multinational technology company with headquarters in Redmond, Washington. It develops, manufactures, licenses, supports and sells computer software, consumer electronics, personal computers, and services. Its best known software products are the Microsoft Windows line of operating systems, the Microsoft Office suite, and the Internet Explorer and Edge web browsers. Its flagship hardware products are the Xbox video game consoles and the Microsoft Surface tablet lineup. As of 2016, it is the world's largest software maker by revenue, and one of the world's most valuable companies. The word "Microsoft" is a portmanteau of "microcomputer" and "software".
Document 6: MS-DOS: MS-DOS ( ; acronym for "Microsoft Disk Operating System") is a discontinued operating system for x86-based personal computers mostly developed by Microsoft. Collectively, MS-DOS, its rebranding as IBM PC DOS, and some operating systems attempting to be compatible with MS-DOS, are sometimes referred to as "DOS" (which is also the generic acronym for disk operating system). MS-DOS was the main operating system for IBM PC compatible personal computers during the 1980s and the early 1990s, when it was gradually superseded by operating systems offering a graphical user interface (GUI), in various generations of the graphical Microsoft Windows operating system.
Document 7: Macintosh operating systems: The family of Macintosh operating systems developed by Apple Inc. includes the graphical user interface-based operating systems it has designed for use with its Macintosh series of personal computers since 1984, as well as the related system software it once created for compatible third-party systems.
Document 8: Gnaural: Gnaural is brainwave entrainment software for Microsoft Windows, Mac OS X, and Linux licensed under the GNU General Public License. Gnaural is free software for creating binaural beats intended to be used as personal brainwave synchronization software, for scientific research, or by professionals. Gnaural allows for the creation of binaural beat tracks specifying different frequencies and exporting tracks into different audio formats. Gnaural runnings can also be linked over the internet, allowing synchronous sessions between many users.
Document 9: Wayfinding software: Wayfinding software is a self-service computer program that helps users to find a location, usually used indoors. This software is usually installed on interactive kiosks or smartphones.
Document 10: Vocaloid: Vocaloid (ボーカロイド , Bōkaroido ) is a singing voice synthesizer. Its signal processing part was developed through a joint research project led by Kenmochi Hideki at the Pompeu Fabra University in Barcelona, Spain, in 2000 (the same team that later founded Voctro Labs) and originally was not intended to be a full commercial project. Backed by the Yamaha Corporation, it developed the software into the commercial product "Vocaloid".
Document 11: Windows 98: Windows 98 (codenamed Memphis while in development) is a graphical operating system by Microsoft. It is the second major release in the Windows 9x line of operating systems and the successor to Windows 95. It was released to manufacturing on May 15, 1998 and to retail on June 25, 1998.
Document 12: Winsingad: WinSingad is a Microsoft Windows based software for singing training.
Document 13: WinDirStat: WinDirStat is a free and open-source graphical disk usage analyzer for Microsoft Windows. It is notable for presenting a sub-tree view with disk use percentage alongside a usage-sorted list of file extensions that is interactively integrated with a colorful graphical display (a treemap). Created as an open source project released under the GNU GPL, it was developed using Visual C++/MFC 7.0 and distributed using Sourceforge. The project was inspired by KDirStat, a KDE application for Unix-like operating systems.
Document 14: Wireless Intelligent Network: Wireless Intelligent Network (also referred to as a WIN) is a concept developed by the TR-45 Mobile and Personal Communications Systems Standards engineering committee of the Telecommunications Industry Association (TIA). Its objective is to transport the resources of the Intelligent Network to the wireless network, utilizing the TIA-41 set of technical standards. Basing WIN standards on this protocol allows changing to an intelligent network without making current network infrastructure obsolete.
Document 15: Mavis Beacon Teaches Typing: Mavis Beacon Teaches Typing is an application software program for teaching touch typing.
ground_truth: software for singing training