在 2016-2021 年，主持人方舟供职于中国国际广播电台（CRI）的广播频率 轻松调频 EZFM, 主持旗舰音乐节目 Music Matters 早间版（周一-周五 08:00-11:00）。而《周末变奏》正脱胎于这份日常的电台工作，其中收录与推荐的作品，比早高峰路上的陪伴更“小众”、更“艺术”、更“另类”；同时，摆脱传统广播在传播方式上的局限，每周通过各大播客平台更新。
《周末变奏》力邀有想法的音乐人与创作者做客，以作品和演出为起点展开访谈，不限定于年龄、风格或语言。这是目前国内为数不多的音乐人深度访谈类广播/播客节目，过往嘉宾包括唱作人李霄云、郭采洁、BowAsWell, 电子音乐人 Yu Su, 另类摇滚乐队工工工、Wolf Alice, 台湾流行乐团傻子与白痴等；同时，《周末变奏》还包括各旁支系列节目，以经典音乐广播风格，播放、介绍冷门好音乐：
《New Nu-Jazz 扭扭爵士》双月更新，放送近期全球发行的新派爵士乐作品，特别关注风格跨界、年轻音乐人、中国本土爵士力量；
《Key Cuts》以短采访的形式，邀请新发行音乐作品的音乐人接过话筒，向听友介绍新作品中的主打单曲；
《百会特别号》收录为网络电台百会制作的特别节目。每个自然月第一个星期二中午 12-13 点，《Key Change with Fangzhou》通过百会的网站与微信视频号直播播出，播出后在播客平台上线。
Music podcast KEY CHANGE was created in July, 2020 by Fangzhou, a former radio host at EZFM of China Media Group, China’s national radio network.
While his morning radio music show "Music Matters" (2016-2021) had introduced numerous independent music acts to millions of audience around China, "Key Change" shifts away from upbeat indie rock & pop tunes, and presents a wider selection of alternative music, ranging from leftfield pop, ambient, neo-classical to alternative R&B and obscure jazz & funk; many episodes are also developed around musical themes, such as revisiting classic albums and trends, newly emerged artists & labels, and stray observations of popular music in daily lives.
Meanwhile, "Key Change" also invites thriving indie artists from China and beyond to talk about their musical inspirations. Previous guests including "Super Girls (快乐女声)" alumni, Chinese singer-songwriter LXY (李霄云), Taiwanese singer and actress Amber Kuo (郭采潔), Beijing-based producer/DJ BowAsWell, Hong Kong-Montreal alternative duo Gong Gong Gong (工工工), Taiwan pop rock sensation Fool & Idiot (傻子與白痴) and British rock group Wolf Alice.
