Even the most basic home router you can buy can EASILY keep up with audio, as long as your provider/cable modem can also keep up. You do not need anything fancy. Even the most basic routers can do 100 Mbits/sec which is more than enough for even the highest sampled digital music, as long as you are not sharing the channel with a lot of other devices.
Since you want to use wifi, there are 3 band choices: 2.4G, 5G and 6Gig. 2.4 has the most penetration and as a result the highest RSSI. 5G has better bandwidth but is prone to radar detection requirements, especially if you live any airport or military installation and hence you will be auto channel switching all the time anytime a radar pulse is detected (this is an FCC requirement). 6G is very new and is most likely prone to firmware errors so I would hold off on it.
So probably your best bet is 2.4G band and if you make your streamer the ONLY device on that band, you are likely to get very good response.