Confirm the title, credited artist, version, and video against a stable artist, label, broadcaster, chart, library, or music-catalog source.
Independent editorial project / Site by OPTIWORK
Why this music archive exists
Music Time Machine is a small, independently maintained listening project. It uses a year dial to place recordings from Korea, the US and UK, Japan, and Brazil beside one another, then adds regional and decade guides that explain why those comparisons are useful—and where they can mislead.
The question behind the project
A calendar year does not produce one universal soundtrack. Radio, television, record labels, live performance, language, and local genre traditions move at different speeds. A song remembered as central in Seoul may have little relationship to what listeners heard in Tokyo, London, New York, or São Paulo at the same moment.
The player makes that difference easy to hear. The editorial archive then slows the experience down: decade guides describe changes in media and production, region guides explain local genre vocabulary, and the comparison method states why four selected tracks cannot stand in for an entire culture.
ScopePopular music associated with the 1970–2022 listening period; later years await source review.
RegionsKorea, US/UK, Japan, and Brazil—four perspectives, not a claim to cover the world.
FormatOriginal editorial context around privacy-enhanced YouTube embeds; no hosted audio or downloads.
How catalog entries are reviewed
Catalog review treats two questions separately: what reliable sources say about a recording's date and version, and why it belongs in a wider listening window. The current player displays the window's reference year, not a guaranteed original release year. Source-backed corrections are published in the curation journal while per-track source fields are being normalized.
Check original release evidence separately from later reissues, chart dates, or the site's wider listening window.
Prefer official artist, label, or broadcaster uploads and recheck videos that are removed, region-blocked, or no longer embeddable.
Keep a selection only when it helps explain a sound, media shift, regional contrast, or durable listening memory.
The catalog is not an official chart and does not sell placement. Corrections take priority over preserving a large song count.
What the archive does not claim
The four regions do not represent the whole world, and the selected recordings do not represent every important scene inside those regions. The archive is especially limited for local, independent, Indigenous, diaspora, and pre-digital music whose official online video coverage is uneven.
Recent years remain provisional. A viral release, a chart peak, and a song that later defines a period are different kinds of evidence. The site avoids “best song” language and treats corrections to dates, titles, sources, and regional framing as normal editorial maintenance.
Who is responsible
Music Time Machine is an independent editorial project. Its interface and website were designed and developed by OPTIWORK, while catalog selection, listening notes, corrections, and rights requests remain the responsibility of Music Time Machine. The archive is not affiliated with YouTube, Google, any chart publisher, record label, broadcaster, artist, or rights holder.
Site design & development
Produced by OPTIWORK, a digital systems partner for websites, web applications, and workflow automation.
Visit optiwork.co.krQuestions, factual corrections, playback reports, and copyright concerns can be sent to kea9997@gmail.com.
When reporting a catalog issue, include the region, selected year, artist, title, page URL, and a reliable source when available. The privacy policy explains third-party services and local browser storage; the terms explain the service's limits.