In Thai [also tonal] people definitely sing tones. The tone is a deviation from the baseline, either up or down or falling or rising or whatnot. So even if you're singing high, you can do a low tone. May be different in Chinese [or just some Chinese music].
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When you listen to chinese songs, there are no tones. People still understand the songs. One cannot sing tones.
In Thai [also tonal] people definitely sing tones. The tone is a deviation from the baseline, either up or down or falling or rising or whatnot. So even if you're singing high, you can do a low tone. May be different in Chinese [or just some Chinese music].